eiffy

i had to a djing set a couple of weeks ago...all good,returned computer to my studio.launched my computer sequencer,which then froze my computer...then switched back on to find that all my usb controllers in device manager had the yellow exclamation mark by them..tried everything i have found on the net to fix the problem with no luck as yet...any help would be greatly apprecciated

hi everyone im eiffy,im a live guitarist for an emi artist,and part time recording engineer/producer........im not the greatest using a computer:(...but im hear to learn some bits and get help when problems arise