Aaaaaaarrrgghh! I just updated my PC from Win 95 to Win Me and in doing so, Scandisk has wiped almost all of my private files! It seems to have turned them all into *.chk files and I can't turn them back!

Can any one recommend me a good file retrieval program? Please, I'm desperate. Please pretty please, with a cherry on top? *falls to knees and starts grovelling* I shall be eternally greatful...