I've had this worm and cured it as follows, you need to get the a fix program, i used fixblast form symantic (see link in j2b's post) and you also need KB823980-x86-enu. This is the patch from microsoft
http://v4.windowsupdate.microsoft.com/en/default.a
sp.
Ideally from an unaffected computor.
Boot-up you're pc and run the fix sofware, after each scan, restart and repeat until you've had 2 or 3 results of no virus found, then you'll need to disable System Restore(this will prevent re-installing the worm if you use a system restore checkpoint). To disable go to the Device Manager by clicking Start/Control Panel/System click on the System Restore tab and at the top insert a tick in the Turn off System restore, click apply and close back to Desktop. Now run the Patch from microsoft, this will now create the Windows fix and the first checkpoint.Once this has been done you can now turn back on the System Restore from the Device Manager. There will also be a Link in the msconfig/startup to remove click on RUN and type MSCONFIG click on the Startup tab and look for MSBLAST, remove the tick and close. To enable the firewall goto you're dail-up, Right click, select Properties click on the Advanced tab and insert tick in the Internet Connection Firewall. Hope this helps