avrdude: Version 5.4-arduino, compiled on Oct 11 2007 at 19:12:32 Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/ System wide configuration file is "C:\Program Files\arduino-0022\hardware/tools/avr/etc/avrdude.conf" Using Port : \\.\COM11 Using Programmer : stk500v1 Overriding Baud Rate : 115200avrdude: ser_open(): setting dtravrdude: Send: 0   avrdude: Send: 0   avrdude: Send: 0   avrdude: Recv: avrdude: stk500_getsync(): not in sync: resp=0x18avrdude: Send: Q   avrdude: Recv: avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x18avrdude done. Thank you.
I'm not sure why it wouldn't work with your board / computers.
Is the other solder jumper (the HWB for the 8U2), on the bottom of the board, connected? It shouldn't be.
I'm pretty sure I found a bad via along the trace from C5 to 8U2-13.