i came on and my trashbin and notepad was open

someone was typing
and i came here and i watched him or her typing and thats all i had open its like how?

Category: Worm

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

Recommendation: Remove this software immediately.

Microsoft 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 local administrator for help.


I scaned my computer and i got this