Mouse freezes for few seconds [closed]

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Hi guys!

Here is my problem: Very frequently, my mouse, and only the mouse, freezes for a few seconds. It seems to appear since I installed nvidia drivers and typed in the command

$> sudo nvidia-xconfig && reboot

Another thing: I think it occured when I installed a dual-screen and reinstalled fedora.
I'm pretty sure its due to nvidia drivers even if I've found nothing while I searched all over the Internet. Somebody else has encountered these kind of freezes?
Any idea? :)
Thanks for readin'

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Additional informations:

nvidia GeForce 580
Fedora 17
Dual screen
the commands I typed in for nvidia drivers were found in this tutorial:
http://www.if-not-true-then-false.com/2012/fedora-17-nvidia-guide/

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