First of all, i would like to say that I do not post very often, so if i have made any mistakes then i apologise.

Form the looks of it, the worm infects OS's that are based on Windows NT technology.
So the following systems need to be patched:

Windows NT4 (ALL SP's)
Windows 2000 (All Varients)
Windows XP (Home and Pro)
Windows 2003 (All Varients)

Our Network has not been infected but here is a quickie on what I did to make sure.

First of all go to the Sysmantec website and download there W32.Blaster.Worm Removal Tools
(www.Symantec.com )

Then go to Microsoft and download there patch for the OS that you are running (www.microsoft.com)


After that you should be ok.

Hope this helps.