Hi,
You could have a 3 party program loading up in the background thats causing this error.
Let's try clean booting the system to remove 3rd party software and see if that clears up the problem.
Follow the steps below to place your computer in clean boot
Click the Start orb on your Desktop
Type msconfig in the Start Search box, and then press ENTER.
On the General tab, click Selective Startup.
Under Selective Startup, click to clear the Load Startup Items check box.
Click the Services tab, click to select the Hide All Microsoft Services check box, and then click Disable All.
Click OK.
When you are prompted, click Restart.
If this does resolve the issue, then see the following Microsoft Article on Clean boot and the section How to determine what is causing the problem to determine which program or service maybe causing the issue.
http://support.microsoft.com/kb/331796
Hope this will fix it for you. Please post back and let us know.
Regards,
Yan Li