I had to recently reinstall Windows 7. Before I did all of my games would be detected. Even CSSv34. Now it barely detects them. I have my Steam folder on my D: drive, but I also have a larger G: drive where I like to put bigger games on, if let's say I install TF2 on G: it's not detectable, move it back to the D: steam folder it's suddenly detectable. I tried compatibility, DEP even anti virus to be turned off, nothing seems to make it work like it use to. On another note other CD installed games like GTA: SA or Diablo: II seem to be detected.

Windows 7 x64 bit Ultimate SP1
GTLite 1.5.0