Hi
Don’t worry buddy… I don’t think it’s a hardware problem. It looks like a corrupted registry entry and it should be solved easily…
Remove the Upperfilters and Lowerfilters values completely from the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{4D36E965-E325-11CE-BFC1-08002BE10318}
…and reboot the notebook
Check also this Toshiba FAQ article:
http://aps2.toshiba-tro.de/kb0/TSB7801XL0000R01.htm
…and the Microsoft Knowledgebase
http://support.microsoft.com/kb/314060/en-us
Bye