Here's the step by step if you're not into computers.

1/ Open the Task Manager (and let if open)
2/ Go in C:\Windows\System32 and delete "igfxupdate.exe"
3/ Go in C:\Windows\SysWOW64 and check if "igfxupdate.exe" is also here, if yes delete it
4/ Open the windows services management console
Start > Execute > services.msc or Start > type "services.msc" in the search bar (Windows 7)
5/ Look for "Search Indexer" -> Right click -> Properties and change the "Automatic" into "Disabled"
6/ Reboot
7/ Open the Windows CMD as an Administrator
Start > type "cmd" in the search bar (Windows 7) -> Right click -> Run as an Administrator
8-> Type "sc delete SearchIndexer" then hit Enter

And you're done !