Tried to install a Memorex 6142u scanner to my HP computer with Windows XP O/S according to directions supplied. All connections checked and re-checked. Software installed, de-installed, and re-installed several times. Keep geting this notice: Scanner not found. Please check the following: (1) Power adapter is plugged in the scanner connector. (2) USB cable is properly connected with the scanner & PC. (3) USB setting is enable in BIOS. I've checked # 1 & # 2, but don't know how to check # 3. ANy help will be appreciated.