Help!!!All my BTC has been withdraw to an unknown address

[mcgeek]

When I was trading on Mt Gox, suddenly I found all my BTC has been withdraw to an unknow address( 18DgU4wbHoEpzsBm2ct9S52pBWXYVStwGZ this is not my BTC address)

here is the last 10 items in my account history:
When   Type   Description   Delta BTC   Delta USD    Total BTC   Total USD
06/08/11 14:50   Withdraw BTC   18DgU4wbHoEpzsBm2ct9S52pBWXYVStwGZ   -6.63   0   0.009   0.623
06/08/11 14:49   Bought BTC   1.67 for 29.9784   1.67   -50.064   6.639   0.623
06/08/11 14:41   Bought BTC   4.97 for 29.69    4.968   -147.5   4.969   50.687
06/08/11 13:35   Sold BTC   6.95 for 28.5134   -6.95   198.168   0.001   198.187
06/08/11 05:59   Bought BTC   6.94 for 27.2253   6.942   -188.998   6.951   0.019
06/08/11 05:29    Sold BTC   6.95 for 27.1722   -6.95   188.847   0.009   189.017
06/08/11 05:28   Bought BTC   6.93 for 27.2256   6.928    -188.619   6.959   0.17
06/08/11 05:28   Sold BTC   6.96 for 27.1226   -6.96   188.773   0.031   188.789
06/08/11 05:28   Bought BTC   0.03 for 27.037   0.027   -0.73   6.991   0.016
06/08/11 04:10   Bought BTC    1.99 for 28.1817   1.987   -55.997   6.964   0.746

How can I get my BTC or money back? thanks a lot!

[astonix]

Unfortunately, transfers are irreversible.

[dingus]

Sounds like your computer and/or mt gox account have been compromised.

[w0mbat]

seems like someone compromised your acc and stole your BTC. any idea who had access to your pc?