Hi wcjlkt. Are there any clues as to what program is initiating this error. If there is no definite pattern, then click Start - Run. Type in msconfig and click OK to exit. In the box that opens click the Startup tab. There will be a list of applications. Click on the boxes alongside any that you don't recognise as important to Windows (if you are in doubt then post a list here). Restart the computer and see if the problem has gone away. If it has, then put the ticks back into the boxes one at a time until the problem returns.
Another thing to bear in mind is that badly written adware can cause these problems. Download and run AdAware click here to see if there is any on your computer.