asp error

i have an asp page and it keeps giving the error "The system cannot find the file specified" for any asp page i run. even a simple page. tell me the easiest fix. it works for htm or html files, but not for asp files. any files saved as "asp" gives this error even if it does not have any asp scriptings. is this an iis issue ? what do i check ? im available by msn or yahoo msnger to get thos resolved.