This might not be interesting for anybody, but I put it out there just in case. I had big problems upgrading from Vista to Win7 on my HP Pavilion tx2000 computer.
Tried everything, system restore worked sometimes, but everything broke again when windows applied updates. Recommendations were changing to MS Internet Security and also a few tips done from text prompt. The solution turned out to be upgrading the BIOS. Not often that comes to mind, at least not to my mind. So get the HP BIOS update from 2009 and your tx2000 will handle Win7. At least so it seams by now.