Disable search indexing for a day or two and see if it helps. If it does, then you know what the problem is.
Rebuild index and see. Open Control Panel, System & Maintenance, Indexing Options. In the Advanced Options, Click on Restore Defaults and also Rebuild Index. Click OK.
Maybe this will work for you. Let us know.
----------------------------------------------------------------------------------------------------------------------------------------------------
oriiON - Welcome to the Windows 7 Forums website! :ciao: