Here's a link to the full info on how to get the Search function back to basic:-
ClickMeQuickly
Or if thats going to far just copy and paste the info between the lines into Notepad and save it onto your Desktop as
ExtraSearch.reg then just double-click it.
-----------Begin Copy and Paste-------------------
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer]
"CaseSensitive"=dword:00000000
"IncludeSubFolders"=dword:00000001
"SearchHidden"=dword:00000001
"SearchSlowFiles"=dword:00000000
"SearchSystemDirs"=dword:00000001
-----------End Copy and Paste----------------------
P.S.
The words enclosed within the little square brackets should be on one line.