If you have a notebook with an extra mouse attached, make sure your mousepad
is working correctly.

Unplug your mouse if necessary.

If you have a desktop and only have the one mouse type, you will need to
go into 'Accessibility Options' and turn on 'Mouse Keys'.

Now open 'Performance and Maintenance' and click on 'System'. Click on the
'Hardware' tab. 'Now click Device Manager'.

Go first into 'Human Interface Devices' (HID). Expand the category and click
on the first one if there is more than one. Highlight and click on
properties icon. The location line will tell you if it is your mouse. If
more than one is listed, click on next one and do same thing. If both claim
to be mice, delete one. If you only have one listed as mouse, leave it be.

Go down the list to 'Mice and other pointing devices'. Expand this category
also. In the case above for notebook, you may have 2 mice listed, HID and
PS/2. If you have both, delete the HID. If you only have 1, delete it. You
will use your 'Mouse Keys' in its place when you reboot.

Close 'Device Manager' and shut down your computer. (A cold boot always
works best.)

Plug your mouse back in if necessary and restart your computer. When the
mouse is found, let Windows continue to install. If your mouse is not found,
use your mouse keys or mouse pad to reopen 'Device Manager'. See if you have
correct listing according to the above.

If this doesn't work, then I can't help you. It is beyond me.

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