Help with my homebuilt

Hello Toms Hardware!

You've helped a lot over the years, and i come to you for help yet again.

I bought this PC late 2006, and have been using it on and off (mostly off, due to errors).

I've had a ton of friends over, sought help on the internet trying to fix my problems, but no success.

The computer in general acts strange. I play WoW, and daily, the computer crashes with errors in what seems like random files of the game. Skype crashes randomly. I have trouble doing Windows updates.

I also get random reboots.

I also have trouble installing programms and games from discs, as the transfers just fail on a random file during the progress. I also tried copying the contents of the said discs to the harddrive, installing from there - as this has helped me in the past. No luck

My first thoughts included a faulty harddrive (Files not being read/written proberly), but i changed my harddrive many times - and get the same errors.

I then thought about cooling, but quickly ruled this out as the CPU is running with a big-ass zalman cooler - and i've been using the computer with the case side of to help the issue.

Any helping identifying the issue?

Specs:
-ASUS P5B Deluxe Motherboard

-A Gigabyte Nvidia Geforce 7950 GX2 SLI package, "3D1-7950 Series". (Bought in one package, effectively 2 cards "glued" together in a single SLI solution).

-Corsair Twin2x PC6400, 2x1024 MB RAM

-Intel Core 2 Duo E6600, Socket LGA775

-SeaSonic S12 PSU, 600Watt

-Maxtor 6V250F0, aprox. 230 GB.


I will provide ANY information - but please help me fix the issue, it's been bugging me for a year.

Like ^ said, it might be a ram problem or unstable cpu due to high oc or temp. Try some different ram that you know works good. If your cpu is oc then put it back to stock settings.

Sorry for bumping, but i wanted to get to you on this.

I ran a memtest on both sticks, and the whole test froze. I then ran it on each, separately, and only one of them failed.

I'm now running on just the one stick.

Do you recommend doing what Kari said, and messing around with the voltages? I never did much OC'ing, or voltage adjustment. Is it fairly safe?

oh, and thanks to everyone for answering - you saved me yet again : -)

-Nobel