Go to Device Manager.
Scroll down as needed until you see Universal Serial Bus Controllers.
Expand that by clicking on the boxed plus sign in front of Universal Serial Bus Controllers.
Should see something like 'Standard Enhanced PCI to USB Host Controller' - key is the word 'Enhanced'.
If it's 'Enhanced', it's USB 2.0. If it's not, then it's USB 1.1.
How old is your computer; you may need a USB 2.0 expansion card.
USB 2.0 introduced in 2001.
On the other hand, it may just be a problem with your USB controllers, so you could uninstall them all through Device Manager and reboot for automatic reinstall and then check the list again.
Edited by petewills , 01 June 2011 - 09:02 AM.