Bootloading Atmega168PV

Hi i am using a Mini Arduino Pro configured as a ISP programmer to bootload atmel chips. I have successfully used it to bootload an arduino uno Atmega328P, buti am having trouble bootloading an Atmega168PV sitting in a custom board. The arduino IDE is giving me the error of

avrdude: Yikes! Invalid device signature.
Double check connections and try again, or use -F to override
this check.
I follow the instructions on here
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1276164280/all
to make the board appear in the arduino IDE.

Ive also tried useing AVRDude with the command
avrdude -v -p m168 -c Arduino -P COM14
this returns the error
avrdude: stk500_getsync(): not in sync: resp=0x00

need to get this project done asap so any and all help would be appreciated, thanks!