No apparent malware so we may be looking at a driver conflict. Let me know if the clean boot option alleviates the problem

Step 1: Start MSConfig

Click Start, type msconfig in the Start Search box, and then press ENTER.
If you are prompted for an administrator password or for a confirmation, type the password, or provide confirmation.

Step 2: Configure Selective Startup options

1.In the System Configuration Utility dialog box, click Selective Startup on the General tab.

https://dl.dropbox.com/u/73555776/Cleanboot1.JPG

2.Click to clear the Load Startup Items check box.
Note The Use Original Boot.ini check box is unavailable.

3.Click the Services tab.

https://dl.dropbox.com/u/73555776/cleanboot2.JPG

4.Click to select the Hide All Microsoft Services check box.
5.Click Disable All, and then click OK.
6. When you are prompted, click Restart.