I have the following:
OS: Windows Vista Home Premium 32-bit (with SP2)
Videocard: nVidia GeForce 8400M GS
I was having some other issues with my videocard, so I went to nVidia's website and downloaded the latest driver available (260.99).
However, upon restart, the display goes blank as soon as the login process is complete. The login screen displays fine, as well as the security screen, but all I get is a black screen for everything else.
Edit: I can easily roll back the driver using System Restore, but that doesn't solve the problem because the original driver had its own problems.
Second edit: I am now installing this driver to see if that makes any difference.
Third edit: Okay, that didn't work. I'm going to add a bit more info below and add a bounty to try to get some answers because this is really bugging me:
Model: HP Pavillion dv6757ca
Fourth edit: I've gotten some very helpful answers and I'm going to start trying some of them now.
Note: I don't actually have a recovery CD, but I do have a recovery partition that I might be able to use.
Final edit: Thanks for the wonderful answers everyone. Unfortunately, none of them seemed to work and it looks like this is one of those issues that will have to remain until the next upgrade.