Use sheet of A4 paper as a mousepad, if it still drifts, than it's not your table and is probably your sensor going a bit crazy.
At which case I suggest you download the latest firmware for your mouse from Razer:
http://www.razersupp...id=474&nav=0,76
Followed by the latest driver:
http://www.razersupp...id=353&nav=0,76
If you're still having problems even with the updated software and with it running a plain white piece of paper, turn the DPI down to 3600.