Alright, you can try a clean boot to see if something may be causing this. To do a clean boot, follow the steps below:
First Step: Perform a Clean Boot
1. Log on to your computer with an administrative account.
2. Click Start.
3. Type msconfig.exe in the Start Search box, and then press ENTER to start the System Configuration Utility.
4. If you are prompted for an administrator password or for confirmation, type your password, or click Continue.
5. In the General tab, click Selective Startup, and then click to uncheck the Load startup items check box.
6. On the Services tab, click to select the Hide all Microsoft services check box, and then click Disable all.
*NOTE: Following this step lets Microsoft services continue to run. These services include Networking, Plug and Play, Event Logging, Error Reporting, and other services. If you disable these services, you may permanently delete all restore points. Do not do this if you want to use the System Restore utility together with existing restore points.
7. Click OK, and then click Restart.
Second Step: Enable Half of the Services
1. Start the System Configuration Utility. Refer to the steps above if you need to see how to do this.
2. Click the Services tab, and then click to select the Hide all Microsoft services check box.
3. Click to select half of the check boxes in the Service list.
4. Click OK, and then click Restart.
More Steps can be found here -
http://support.microsoft.com/kb/929135/en-us
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