You could have a few problems on your hands but with the limited information you provided I would suggest the following.
Search for Bios Update on MOBO. If unavailable Flash your BIOS. Google how to Flash Bios if you do not know how.
Check for PC driver updates if you have a Manufactured system. Manufacturer support site should have driver updates.
Restart your PC after each update.
Once you have updated all the PC/MOBO/Component Drivers I would proceed to update to latest NVIDIA driver for your 6200 GeForce.
Nvidia should have these on their website.
Restart PC. Test.
If this fails, you could have bad RAM. You could download a ram test ISO, burn to CD, restart PC with it in CD drive and it will run a RAM test. Not fullproof but would determine whether you have a bad RAM Module. If you have more than one RAM module for the PC (IE 2 RAM Chips) you can try running with one of them, then if no improvement, swapping with the other, as an alternate test.
You could have serious OS issues, System Restore could assist here, but if the PC has no restore dates or if this problem has been consistent since you got the PC no saying what that would do. OS Recovery is next option.
Have you checked your Device Manager to see if any components are having conflicts? Not sure what Anti-Virus you run, but if you have none I suggest downloading free version of AVG. SCAN ... clean system. For malware/adware Ad-Aware 2007 (think that is a recent version) download and run/clean. Both programs available on CNET.
Try to find more out about your error, sounds too generic for me as there is typically an error code generated. Google it if you can find more details, see other peoples suggestions for similar problem.
You could have a bad Hard Drive. If you get to the level of everything not going anywhere, my typical step would be to pull your graphic card and your ram, then reinstall them. (Don't have a technical reason I do this but sometimes it just works) and to reformat your Hard Drive and reinstall your OS. If you have a ******** PC that was provided with a Partitioned HD for OS recovery/repair/re-installation, best of luck to you. My experience is that without an OS Disk... fresh reformat and reinstallation of OS is likely to have lots of hiccups.
Best of luck.