X300 USB mouse (and bluetooth mouse) stutters

Hi,
I have a X300 which works really great apart from one really annoying problem:
The internal mouse works great (UltraNav) however when I connect an external USB mouse (Logitech or Microsoft) the mouse sometimes works great but may times it stutters very badly.
I am running Vista with 802.11N (tried G with the same problem), Kaspersky and Firefox.
I thought that I might have a problem with the USB mouse conflicting with my WIFI so I bought the Lenovo Bluetooth Mouse - only to see the same problem.
One thing I noticed was that even if the external stutters - the internal Ultranav works like a charm - no stutter at all.
Any ideas?
Message Edited by linda1981a on 10-31-2008 05:05 PM

This is still happening, no one else having this problem?

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X300 USB mouse (and bluetooth mouse) stutters

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