you have a nice file infector…and file infectors is usually very bad news

Win32/Parite
http://www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?name=Win32%2FParite

Recovery It is not possible to recover manually from Win32/Parite. Consult your antivirus software vendor for specific directions for removing this Trojan.

Virut and other File infectors - Throwing in the Towel?
http://miekiemoes.blogspot.com/2009/02/virut-and-other-file-infectors-throwing.html