Search Companion Doesnot Finds Anything

I've long made good use of the ability to search for files in my computer running Windows XP Professional by providing the Search Companion with "All or part of the file" or "A word or phrase in the file," but the Search Companion has suddenly begun behaving strangely. Sometimes when I run a search now it claims it found no files at all matching my criteria even though I know such files exist, and other times it lists some or all of the files it found multiple times (yes, with multiple listings of a single file within a single folder). And when it says it found results now, too, some of the files it lists appear in blue rather than the customary black.