Suddenly my USB drives on my E-machine T3626 with

click on start, then type restore into search box and hit enter. then restore to a earlier date when all was working ok....
hope this helps dutch

It needs to be reset in your BIOS. But first try right-clicking on the USB in Device manager and then click on properties..follow those instructions first. If still not working then you then upon startup you should see a message that says press "F>>to enter setup>. Once inside BIOS on one of the pages look for ports..toggle anything and all boxes that have USB in front of them to "ENABLED".. that should fix it,if not then you may need to buy new ports..but that is a different subject..let me know if you have any questions.