I believe the idea was to make sure no drive letters where disabled.
Open TweakUI, click +My Computer , click Drives, make sure none are unchecked, you may also want to make sure no drives have autoplay disabled (unless you decided to turn it off) click +Autoplay, click drives.
PS. So you definitely have a card in the camera and it's not storing the images on its' non-removable camera drive?
If so it may be easier to buy a (relatively cheep I believe) card reader, thats if your printer doesn't have a multi-card reader in it which you could use.