I would reformat, Anti Virus is fairly useless to be perfectly honest (norton even more so unless their new one has changed), you should still have it - before getting infected.
Here are some solid steps to get you started (assuming a format isn't an option):
click: start > run
Then type in:
then type in this command:
Code:
echo #begone > \windows\system32\DRIVERS\etc\hosts
//edit
also type this command into the black box at this point:
//
now goto this url:
Code:
http://housecall.trendmicro.com/uk/
And follow its instructions to let it scan your computer for problems.
These are just starting steps to cleaning up though.
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