What you describe can be caused one of the following, lack of system resources, a flaky power supply and overheating -a flaky PSU can also cause overheating.
Please do the following, when you reply can you also tell us the brand and model name or number of the PSU (power supply unit).
Go to Start
then to Run
Type in compmgmt.msc
and click Enter
On the left side click on Disk Management
On the right side you will see your hard drive.
Now I need you to take a screenshot and attach it to your next reply.
Do the following to take a screenshot while the above is open and showing on your desktop.
To capture and post a screenshot;
Click on the ALT key + PRT SCR key..its on the top row..right hand side..now click on start...all programs...accessories...paint....left click in the white area ...press CTRL + V...click on file...click on save...save it to your desktop...name it something related to the screen your capturing... BE SURE TO SAVE IT AS A .JPG ...otherwise it may be to big to upload... then after typing in any response you have... click on browse...desktop...find the screenshot..select it and click on the upload button...then on the lower left...after it says upload successful...click on add reply like you normally would.Screenshot instructions are provided to assist those that may read this topic but are not yet aware of the how to.