Crashing to desktop?

Have 32 MB Ge Force 5200 Go. Crashed to desktop almost every time I built a world wonder. Updating video drivers seemed to help. Got through my first game with no other problems.
 
I've started to have a bunch of CTDs now. Previously I was getting the wonderful black monitor/reboot issue but now it seems to have transformed into the CTD problem. I have that same error in the event log when this happens...

The description for Event ID ( 0 ) in Source ( ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: 7.

(Doom 3, Far Cry, BF2, Thief 3, HL2 all work flawlessly)

3Ghz P4
1 GB RAM
Sapphire Radeon 9800 Pro (Just updated drivers as of today, no help)
Audigy 2 ZS Sound Card
Asus P4C800-E motherboard
XP Pro w/ SP2
 
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