Monitor does not wake up and mopuse cursor frezzes

I have XP Home. I have three monitors, two on on nVidia GeForce 7600 GT and
one on another nVidia GeForce 7600 GT.

When the monitors go into Screen Saver mode, sometimes, when I click the
Space bar to wake them up, the third monitor (the one with its own card, and
not hte main montor) does not wake up and the mouse pointer frezzes. I have
to reboot.

I wanted to see if iPoint was the culprit. I have 6.1 installed, and the
mouse is Microsfot Wireless Laser Mouse 6000. So, I tried to uninstall. I
get the following message:

"Windows INstaller. The feature you are trying to use is on a network
resource that is not available. Click OK to try again, or enter an
alternative path to a folder containing the installetion package 'ip61.msi'
in the box below."

The 'box below' points to my external backup hard drive:
i:\2306ebedb6a08dc8f5a3c9\ipoint\setup

When I click on it, the folder cannot be found.

I have tried several ways of uninstalling, but I cannot do it.

I would like to ask if there are known problems with ipoint, and if there is
any way (via the Registry, for example) I can uninstall the faulty ipoint?

Thank you very much in advance.

Hans L