Du menar att det låter om hårddisken? Kan beror på detta :
"One way to improve search performance is by switching on the Indexing Service. This uses idle CPU time to make a database of all your files, which is then used to assist in searching. This can speed up a search, but it will mean your system will resort to crunching in its spare time. If you find this slows your system down, you can turn it off through the Change preferences button in Search, or by running services.msc from the Start | Run command (or <Windows key> + <R>). Locate the Indexing Service, Stop it, go to its Properties, and set it to Disabled."
Testa att stänga av och se om det blir tyst.