I have an HP T45, I use the proxy R45 default drivers that normally comes with WinXP 32-bit edition. The reason why, is because I don't have to install from any files and because HP's version of the WinXP T45 sucks and is really buggy.
However, you have certain limitations, like some software support and bad things that happen 'cuz when I hit cancle on my printer the OS tells the printer to keep printing jibberish stuff until the computer is restarted lol
So if you're desperate try installing a model similar to the version of the printer and just do a force install then test it out