There is an MSBlaster worm which willl exploit the existing and legit
Msblast.exe file.

W32.Blast is a worm.

Virus Information Center
Win32.Poza
Alias: DcomRPC.exploit,
W32.Blaster.Worm (Symantec) ,
W32/Lovsan.worm (McAfee),
W32/Msblast.A (F-Secure) ,
Win32/Poza.Worm ,
WORM_MSBLAST.A (Trend)
Category: Win32
Type: Worm
Published Date: 8/11/2003
Last Modified: 8/11/2003

Download ClnPoza.zip he
http://www3.ca.com/virusinfo/virus.aspx?ID=36265

I don't knwo what Msblast does, I would not remove it.

It will keep throwing up error messages and reboots your computer,
monotonously(sp?) as long as your modem is running.