It is bad manners to post in capital letters, it is considered to be shouting.
Have you installed any add ons? I take it that you have Windows 7? I had a problem in W 7 with one particular add on, try disabling them one by one and see if the problem is solved. If you have not added anything to the computer take it back to where it came from and complain. Don't be fobbed off, it is the shops job to sell you usable products.