Blue Screen of Death?

Hi, computer constantly crashes and gives me a blue screen every so often. It says IRQL_LESS_OR_NOT_EQUAL or something around those lines. Any idea how to fix this, i've read up on it but nothing seems to fix it. Thanks.

Please post the exact error message and any associated error code number. Also such error codes may identify a "location" where the error is happening. This "location" may be a long stream of seemingly senseless numbers and alphabet characters. The "location" is less important than the exact error message, but please include it. If you "google for the error message you printed in your post, I think you are going to get references to some bogus information. Thanks