Windows built in file searching mechanism is not much efficient. There are other free utilities like Google Desktop Search for finding files in Windows. DK Finder is a free utility for file searching in Windows. Finder has some advantages over its competitors that its more precise and less CPU load. Initially, DKFinder creates an index of every file on your system, and this process can take a while, but once the index is created, you can search for files, and narrow those results, using a wide range of criteria.
DK Finder periodically indexes new files to make sure your results include the newest files on your hard drive, the program re-indexes only those files newly created or updated since the prior indexing session, so results take less time.