Games work slow

Hi, You said ALL your games are choppy ....Conan is a demanding game ..
Example:

I have seen it run on a MSI board with 2 Gs of PC6400 (800mhz) / AM2 4800 X2 (2.5Ghz) with an AGP!!! GS7800 Nvidea video card (which was a good card in its day...42Ghz bandwidth) ...it ran at about 30fps on Medium settings which is livable???...

The first thing to do is to make sure you have all the latest drivers for your Motherboard from HP (made by Asus for HP )
also make sure Windows OS it self is all up to date ....
The video card is 8800 Nvidea ? which one?
Go to the Nvidea and get the lastest drivers for it ...this is MOST IMPORTANT ...
You also have onboard Graphics card 6150 ...go to Device Manager and see what is listed....To access Device Manger Go to ....Start>Control panel > Systems ( maintenance) and select Device Manager....click the + sign next to Display adapters and if the (6150 onboard graphics adapter) is listed with the 8800 right click on the "6150 " choose Properties and make sure it says..... ( do not use (disable) under .".Device usage."....
....Apparently these can run concurrently

HP says PC6400 Ram (800 mhz) will run on this board.....a PRICEY option of course
NOTE: All RAM isn't created equal it is best to use a Quality RAM from the SAME manufacturer //try not to mix n match

Lastly there's the Power Supply ...the new Video card will draw more power ....a good 500 plus watt PS with good Amps well
across the Voltage rails 3/5/12 .....25A plus is a good target
Again more money :)

Also turn OFF Programs while gaming I do no matter how fast the Rig is .... ie Antivirus...etc..... every little bit helps

Do the Driver updates and see what happens ...Good Luck