[ubuntu] Clicking Addition Drivers does nothing

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http://ubuntuforums.org – hi my system is running like crap .. its stuttering when even ;loading terminal .. there is lag b/e typing etc in terminal and other packages like ff.. it is same behaviour like running video in xp with no drivers installed.. i thought to use old nvidia drivers .. but when i clicked "additional drivers" nothing would happen.. i ran Code: sudo jockey-gtk and got the following r@rDT:~$ sudo jockey-gtk [sudo] password for r: Traceback (most recent call last):   File "/usr/bin/jockey-gtk", line 420, in <module>     sys.exit(u.run())   File &q (Hardware)