Usb and memory card slot on front of my Dell

backup as many of the programs and personal stuff that you can to cd/rw or dvd/rw otherwords stuff you dont want to lose. then restore your computer... you might have the discs that came with your pc if not there might be a restore partition on the hard drive.. you can access this only when you first restart the pc. and and continously pressing f2 hope this works for you..

insert the recovery disc or the drivers disc that came with your desktop. reinstall the Card reader and USB 2.0. have made any changes recently in the wirings inside or any new IDE/ SATA devices? this could also be due to incorrect wirings...