Problem Uploading to ATTiny84 - Verification Failed *help*

Trying to upload code to an embedded ATTiny84 and haven't been able to accomplish anything. I have attempted it with 2 different versions of the USBTinyISP programmer and using an Arduino Pro 5V ATMega 328 board as a programmer.

I am working from a 64bit Windows 7 machine. I had to turn off digital driver signing to get the drivers for the USBTinyISP but I believe everything is working on the Windows side of things. Right now, I have abandoned the code I want to upload and am attempting just to upload an empty bare minimum sketch.

I tried "burning bootloader" with the same verification error I was getting when attempting to upload the sketch. Same problems on either 1 MHz (factory setting) or 8 MHz.

Verbose output is below. Notice it is getting the device address. I also see a line "avrdude: programmer operation not supported". I don't recall seeing this in normal operation but I usually browse right past the verbose output unless something goes wrong.

avrdude: Version 5.11, compiled on Sep  2 2011 at 19:38:36
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2009 Joerg Wunsch

         System wide configuration file is "C:\Program Files (x86)\Arduino\hardware/tools/avr/etc/avrdude.conf"

         Using Port                    : lpt1
         Using Programmer              : usbtiny
avrdude: usbdev_open(): Found USBtinyISP, bus:device: bus-0:\\.\libusb0-0001--0x1781-0x0c9f
         AVR Part                      : ATtiny84
         Chip Erase delay              : 4500 us
         PAGEL                         : P00
         BS2                           : P00
         RESET disposition             : possible i/o
         RETRY pulse                   : SCK
         serial program mode           : yes
         parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         ByteDelay                     : 0
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom        65     6     4    0 no        512    4      0  4000  4500 0xff 0xff
                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           flash         65     6    32    0 yes      8192   64    128  4500  4500 0xff 0xff
                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00
                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           lock           0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           lfuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           hfuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           efuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00

         Programmer Type : USBtiny
         Description     : USBtiny simple USB programmer, http://www.ladyada.net/make/usbtinyisp/
avrdude: programmer operation not supported

avrdude: Using SCK period of 10 usec
CMD: [ac 53 00 00] [0c 52 53 00]
avrdude: AVR device initialized and ready to accept instructions

Reading | CMD: [30 00 00 00] [00 30 00 1e]
CMD: [30 00 01 00] [00 30 00 93]
################CMD: [30 00 02 00] [00 30 00 0c]
################################## | 100% 0.01s

avrdude: Device signature = 0x1e930c
avrdude: NOTE: FLASH memory has been specified, an erase cycle will be performed
         To disable this feature, specify the -D option.
CMD: [a0 01 fc 00] [00 a0 01 ff]
CMD: [a0 01 fd 00] [00 a0 01 ff]
CMD: [a0 01 fe 00] [00 a0 01 ff]
CMD: [a0 01 ff 00] [00 a0 01 ff]
avrdude: erasing chip
CMD: [ac 80 00 00] [00 ac 80 00]
avrdude: Using SCK period of 10 usec
CMD: [ac 53 00 00] [00 ac 53 00]
avrdude: reading input file "C:\Users\tschmit\AppData\Local\Temp\build3410578510269068080.tmp\BareMinimum.cpp.hex"
avrdude: writing flash (320 bytes):

Writing | CMD: [4c 00 00 00] [36 4c 00 00]
##########CMD: [4c 00 20 00] [00 4c 00 20]
##########CMD: [4c 00 40 00] [00 4c 00 40]
##########CMD: [4c 00 60 00] [bf 4c 00 60]
##########CMD: [4c 00 80 00] [cf 4c 00 80]
########## | 100% 0.39s

avrdude: 320 bytes of flash written
avrdude: verifying flash memory against C:\Users\tschmit\AppData\Local\Temp\build3410578510269068080.tmp\BareMinimum.cpp.hex:
avrdude: load data flash data from input file C:\Users\tschmit\AppData\Local\Temp\build3410578510269068080.tmp\BareMinimum.cpp.hex:
avrdude: input file C:\Users\tschmit\AppData\Local\Temp\build3410578510269068080.tmp\BareMinimum.cpp.hex contains 320 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 0.23s

avrdude: verifying ...
avrdude: verification error, first mismatch at byte 0x002f
         0xe0 != 0xf0
avrdude: verification error; content mismatch

avrdude done.  Thank you.

The ATTiny84 is a SOIC-14 chip soldered in-system. All pins are floating are except for MOSI, which has a 10K pulldown. I am skeptical that the 10K pulldown could possibly cause any problems.

This is all using Arduino IDE 1.0.5r2

I'm stumped and I'm under some time pressure to get this project finished. Any help would be greatly appreciated.

Update:

I managed to find a 32 bit Windows XP machine and installed the older version of the Arduino IDE 1.0.5 and didn't have any problems uploading the sketch or burning the bootloader...

Evidently the problem is in the Windows 7 machine and how I have the Arduino IDE setup? What can I do to get up and running correctly?

I have exactly the same problem and have been using an old xp desktop machine as a workaround as well, but would like to have my W7 laptop going so I can take into shed. Did you find a permanent solution to this?

I have installed the driver Download | USBtinyISP | Adafruit Learning System but is not digitally signed but seems to install ok apart from the same.

Programmer Type : USBtiny
Description : USBtiny simple USB programmer, USBtinyISP - Inexpensive USB AVR Programmer
avrdude: programmer operation not supported