This is the thread I found on problems with the 6600GT.
The problems incude suffering from intermittent freezing, crappy performance in games, films freezing, windows being generally slower than usual etc. My PC spec's are as follows:
AMD xp3200 CPU
GA-7NNXP Nforce2 Mobo
1Gb Dual channel memory
80GB SATA HDD
Fresh install of Windows XP Pro (with SP2)
I know it's not top of the range, but it shouldn't be performing as bad as it does. I've been doing a bit of experimenting with various drivers, and have found the following things:
The PC works better in safe mode than it does with drivers installed. This confirms what many of us have found, i.e. the drivers are broken. Freezes at startup are cured without drivers installed, but then you have crappy performance due to lack of drivers or a duff chip
I have found the strangest thing though... the random freezes at startup can be recovered from on my PC by simply turning my monitor off and back on again. Again, I stress, this works on my PC. Someone will have to test it on theirs to see if it works. Also, the choppy performance in windows disappears once I open a game (which IIRC, is when the GPU clocks itself at 500MHz) leading me to believe the bad performance in windows is possibly related to the clock speed of the GPU.