Download Belarc's Advisor (free) and post what it says about your mobo:
Cut out your autoloaders:
Also, cut out your autoloaders. Click Start--> Run--> type msconfig--> Enter--> click the Startup tab. Uncheck everything except your anti-virus, firewall, and anything you absolutely need (like your broadband and such)... Click Apply--> Restart. You will probably notice that your computer starts up a whole lot faster. Oh, and when your computer does restart, you'll have a reminder box pop up (the System Configuration Utility). Check the don't run on startup box, then OK.
Cutting out all the programs that loads with Windows may get rid of the problem if it is a software conflict.
You may also have adware/ spyware on your system. Download MS AntiSpyware (free if you have a legitimate copy of Windows):
Try these out and post back if they helped.