Mouse Doesn't Work

I've been trying to reinstall my Logitech Marble Mouse but everytime
use the disc to install it tells me that it is not compatable wit
Windows XP but I know it is. When I check in Device Mananger it say
the trackball is not configured correctly and is not digitally signed
I've already tried uninstalling and reinstalling and I have searche
the web for the drivers I need but nothing seems to work. Please hel
restore my mouse function. I HAVE NO MOUSE AT ALL!!! What can I do t
make it work again??

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nyssa739