*SOLVED* 9600 GT problems :(

So a while ago I got a new video card, Nvidia 9600 GT , and a new motherboard. So when I turn my comp on it works until after the windows loading screen (I have Windows XP btw) when the screen goes black with artifacts towards the top of the screen . It only happens about half the time though! When it does work it works very well in gaming I just love the good graphics. Then every so often out of nowhere when I'm doing anything (web browsing, gaming, etc.) it would just freeze and it would have artifacts towards the top of the screen and really loud scratching weird sound would come out of my speakers.





Any advice to fix these problems?

I don't think it's temp. because I can play right away after it crashes, and it's very unpredictable, like I can play for 6 hours and nothing will happen, but sometimes ill play for like half an hour and it will crash, or it will crash when i'm just web browsing after 10 minutes. It's just sort of.. random ... I checked it anyway and the core temp for my graphics card GPU is 50 C my graphics card fan is at %10. my other fan is at 1461 RPM.

How do i check my CPU temp with speedfan?

EDIT:

heres a screen shot of SpeedFan on my comp

My old graphics card drivers are gone already and yes I did reinstall windows.

I just disabled my sound device.

EDIT:
So it just crashed again(with sound device disabled). It seems to crash when I do certain things like when I use Game Maker and press execute to test my game, it seems to crash half the time I do that

Check the voltage on your RAM and make sure it is whatever is necessary; the JEDEC standard for DDR2 is 1.8V, but many RAM manufacturers believe it is ok to ignore that standard if they tell people about it. Your mobo would default to 1.8V on any BIOS reset (which you probably did when you installed it), and that may not be enough for your RAM. If you're sure the voltage is sufficient, run Memtest86+ on your RAM.

Ok so I don't know how check my voltage on my ram but i read somewhere that its Vcore2 on SpeedFan, I don't know if that's true but it says Vcore2 is 4.08V and Vcore1 is 1.23V on SpeedFan. If that's not it, then could you tell me how to check my ram voltage?

Haha ok I will have to do that later today, I'm busy today, but I'll post once I find out.

EDIT:
So I changed my memory voltage(I think it was called that..) to 1.9V and it seems to be working fine. I will monitor it for a few days and if there is any problems I will post here. Thank you coozie7 and jtt283 so much for your help.

That it has been more stable with a voltage increase strongly suggests the problem is with your RAM. Was 1.9v enough for it? Run Memtest86+ on it now.

You'll be looking for errors. And yes, try 1.95v. What voltage range is on the little sticker on the RAM stick? What are your mobo and RAM brand and model?

Switching the voltage to 1.95 solved everything!!! Thank you jtt283 and coozie7 for the help! (and thanks K-ous for the attempt )

Off to play Oblivion!