328P-PU and 168PA-PU bootloader problems

Yesterday my TinyUSBISP arrived. Fairly quick for HongKong standards. I was ofcourse excited to try it out so I went to Arduino GUI and tried to burn the bootloader. "Error, bad signature". Ok fine, so I went out to look for the correct signature for my 168PA-PU. 1E 94 0B if I remember correctly. After altering some files I managed to get the bootloader on. Or at least, it gave no errors.

However, now I cannot get anything on the 168PA-PU. I tried connecting the arduino board and using that as a programmer and I have used the ISP header and the USBTinyISP as a programmer.

"Not in sync"

So here I am, back to 0. I have altered drivers, conf files etc. I might try it on another pc. So assume I have e freshly installed windows and that I have just downloaded the Arduino installation zip. What should I do?

Is the bootloader badly burnt since I "tricked" avrdude by changing the signature and nothing more?