first warning you get is this:

Category: Worm

Description: This program is dangerous and self-propagates over a network connection.

Recommended action: Remove this software immediately.

Security Essentials detected programs that may compromise your privacy or damage your computer. You can still access the files that these programs use without removing them (not recommended). To access these files, select the Allow action and click Apply actions. If this option is not available, log on as administrator or ask the security administrator for help.

Items:
file:C:\NeCRoNoMiCoN\addon\STYLE.$$A

pressed ignored..sees what happens next..