Old card: http://www.newegg.com/Product/Product.aspx?Item=N82E16814128184 (Don't remember where we actually bought it from. Also the cooling fans on it are shot now.)
New card: http://www.newegg.com/Product/Product.aspx?Item=N82E16814500221 (Actually bought it from TigerDirect for cheaper, but whatever.)
Did like it said to do. Uninstalled the old Forceware drivers (And I mean OLD, seems drivers for the FX series don't go past FW 96.85), then ran Driver Cleaner Pro set to nvidia like nvidia suggested.
Shut down, removed the old card. Put the new one in. So far so good.
Installed the latest "WHQL"(Recommended) drivers (FW 285.62). Restarted again. Things seemed to be working so far. Went to youtube and loaded a 1080p video fullscreened. Worked great. (The old card often had trouble even with non-fullscreened 720p.)
Went to play a little Minecraft. Hit "log in", it logged in, and then closed, leaving a hs_err_pidxxxx.log file on the desktop. Tried again (repeatedly), it did it again (repeatedly). Tried uninstalling/reboot/DriverCleaner/reboot/r
The log files were all showing
# Problematic frame:
# C [nvoglv32.DLL+0x69cb45]
and looking that up, and reading people trying all the things I'd already tried, one site suggested downgrading the drivers. And new drivers were one of the changes, so... I downloaded FW 280.26 (the previous "WHQL"(Recommended) driver), and did the whole uninstall/reboot/DriverCleaner/reboot/re
(I'm tempted to get a third 1GB stick of PC3200/DDR400 and max out the ram this board can handle, see if that helps any too... Might even have one sitting around in a spare computer, I'll have to look...)