My system crashes when I play 3d games. At an certain point in most games it just crashes and restarts my pc.
When I lower the resolution / details / shading most of the time I can play beyond that point in the game and undo the changes to resolution and play on.
I FIRST tought it was a problem with the drivers of my videocard or motherboard. But after a FRESH install of Windows with all the latest drivers the problem remains. By now I think the problem lies with my PSU. It is 4 years old whereas most a my pc has been UPGRADED since then.
Anyone any other tought on what the problem could be?

Specs
Antec Smartpower 2.0 500W
MSI P45 neo
Intel Core 2 Duo E6750
4 * 1G DDR2-800
Club 3d 8800GTS 512mb
3 * 7200RPM SATA harddisks
TV Card
DVD-player
DVD-burber

Before new install Vista 32bit now Windows 7 64 bitYkou have answered your own question.

The PSU is not BAD, but after four years it gets a lot of dust and crud in it and has to have a DEEP cleaning. It is overheating.

Or remove some of the hardware you do not need.