Help! Worm spread through Messenger (New Variant Of WinSerflog or W32/Sumom-C)

http://www.sophos.com/virusinfo/analyses/w32sumomc.html

This is a nasty worm distributed via msn messenger. It does not allow
any of the anti virus programmes to run and it shuts down regedit and
many other program windows.

The Norton Antivirus Serflog removal tool for A and C versions does not
work as I think they refer to an earlier version of this nasty virus.
There is information on the new version in the above link but their
recovery suggestions relies on using regedit which the worm totally
prohibits (it also does not allow access to their site or Norton
Antivirus, I tried searching the host file to no avail). Does any one
have any ideas please how to get rid of this nasty programme? There is
nothing on Microsoft or Norton Antivirus about this latest threat.

I even tried downloading some shareware registry editors but the worm
shuts down those programs as well.

I was running Window XP SP2 with Norton anti-virus and windows anti
spyware and it still got me!