This new "network walker" virus is written in VB and affects workstations as they boot up. It disguises copies of itself on the hard drive or network drives as Word documents (using the Word icon).

BootMerlin Virus - Modifies Windows Boot-up
http://vil.nai.com/vil/content/v_141514.htm
http://secunia.com/virus_information/36315/bootmerlin/

QUOTE
Key Symptoms include:

1. Wizard animation advocating anti-Microsoft messages in Spanish

2. C:\Boot.ini modified

3. Anti-Windows or Anti-Microsoft messages displayed by Windows Boot Manager at boot up time.

4. Presence of the file on hard drive or network drives where write access is permitted