Vista making my comp crash?

I'm running Windows Vista Home Premium 64-bit for system builders OEM for my specs I've got

* Intel Core 2 Quad Q9550 Yorkfield 2.83GHz 12MB L2 Cache LGA 775 95W

* MSI OC GeForce GTX 260 896MB 448-bit GDDR3 PCI Express 2.0 x16
clocked at 655MHz

* Intel BOXDP45SG LGA 775 Intel P45 ATX Intel Motherboard

* Western Digital Caviar Black WD1001FALS 1TB 7200 RPM 32MB Cache
SATA 3.0Gb/s 3.5" Hard Drive

*2x G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666)
Dual Channel Kit Desktop Memory for a total of 8

*Thermaltake Armor Series VA8003BWS Black Full Tower Case without
large side fan

* Apevia Iceberg 680W Blue ATX Power Supply from FRY's electronics

* Zalman ZNPS9700 LED heatsink for the processor because the stock
was horrible

* Soyo 19" LCD Monitor black(upgrading next week if u have any suggestions or reccomendations email me at Choviatt@cox.net)

* I have many games on it not sure if they could be causing the problem
so here they are

1. World of Warcraft+all expansions
2. Half-life2
3. Team fortress 2
4. portal
5. CS source
6. Unreal Tournament 3
7. Assassin's Creed
8. F.E.A.R.2 Project Origion
9. Neverwinternights2+ all expansions
10. Mass Effect
11. Oblivion+shivering Isles expansion
12. Dark Messiah of Might and Magic
13. Battlefield 2+special forces expansion
14. Battlefield 2142
15. Dark Sector

I use Google chrome (though it started before i got it) for my internet browser and my comp had been freezing up at times it may be in the middle of the game or just browsing the internet but when it happens the screen freezes on the picture the mouse and the keyboard turn off the fans and lights keep going and a screeching sound plays over my speakers the board light and internet connection lights are still on but its non responsive though i can hold the power button to shut it down and reboot. Or it will just reboot all by itself without any of the freezing not just shutdown, but shutdown and restart.

I got most of my parts from newegg if u need more specifics on them


I believe the problem lies with my part drivers and incompatibility with vista because i get this error every time it does it HttpEvent 15016 (looked it up and kind of similar stuff) I've ran all of the tests on my system that i can hardware wise heating is good voltage fine hardrive checks out and so does memory everything is compatible but it keeps happening and I don't know what to do I can't really ask Microsoft because i have the OEM

 

Also my copy of vista came with service pack 1 so i cant just uninstall it