Danicek
Sentinel
AthlonXP or Athlon64? (okay, good)
Red. That´s not enough for good performance. You´re out.
That´s a rather slow card, as indicated by the LE. Should be okay though.
Don´t use the word "performance" if your PC belongs to the red category.
Conclusion: Buy more RAM.
I don't think the LE card is able to handle Gothic 3. Full 6600 has very hard time, 6600GT is better.
So I would say - buy new GPU and add at least 512 MB of RAM or give it up (unless you don't care about graphics in which case it will work for you with all candy turned off).