Your computer is probably infected by W32.Mydoom.H

[management na muni.cz]

Dear users of muni.cz,

Our antivirus software has detected a large amount of viruses outgoing
from your email account (editors na muni.cz), you may use our
removal instruction to clean up your computer software.
The attached file is a help file containing the removal instruction
of W32.Mydoom.H.

(This is an automatic virus detection mail created by Symantec
Norton Antivirus 2004 for more info about Norton Antivirus
2004 visit www.symantec.com)

Norton Antivirus 2004 Enterprise Edition
www.muni.cz