yahoo messenger question

[Apex]

I havent had messenger for very long (a couple days)
never had any problems till this morning.
I start getting tons of requests from people I never even heard of and I meana like 20 or more in under a half hour
I finally had to shut it down.

I'm afraid I might have picked up a virus or something even thou a scan showed I was clean?

Any ideas?:dunno:

edit
I'm using AVG antivirus