I have some serious problem with my desktop display

I have a desktop computer with System Model DG31PR , Processor Intel(R) Core(TM)2 Duo CPU E7200 @ 2.53GHz, 2533 Mhz, 2 Core(s), 2 Logical Processor(s) I was having 4GB ram on it for some reason the second slot is not working. so now its running with only 2 GB and the display pixelates when I ebter into Safemode its fine or else I am not able to see anything on the scree it only pixelates with grain mixed lines completely. I was having this issue before but ti was at time.. I checked with Monitor but its no fault since it works in safemode.

Steps Done :

1 . Installed the drivers which was downloaded from intel site
2. Tied to disable the services and rest dunno whgat to do please help meeee

My Desktop is not a HOP assembled still will it work??

no actually HP envy is my laptop and I have another desktop which was assembled the specs is

ystem Model DG31PR , Processor Intel(R) Core(TM)2 Duo CPU E7200 @ 2.53GHz, 2533 Mhz, 2 Core(s), 2 Logical Processor(s)

MOnitor is Viewsonic...

ur reply worked partially when I disable the drivers under display adapter its working fine with windows 7 but if I install it then again it gets pixelated

anyother solution?????

no its not doing that

Uninstall the driver including its software in Device Manager.

Enable Automatically deliver drivers via Windows Update (Step 3) and run all rounds of Important and Optional Windows Update to completion, both for the driver(s) needed and any performance updates which might be needed to smooth their performance.

If this doesn't provide a suitable driver, then import the latest from the HP support Downloads webpage for your model.

Are you still running the HP factory preinstalled WIn7 which is the worst possible install of WIn7 one can have? If so do what most tech enthusiasts do and Clean Reinstall - Factory OEM Windows 7 which provides everything needed to get and keep a perfect install.