Detecting a program on a remote computer, Possible?

[RottNKorpse]

I have had people contacting me saying there is a virus on my site but I've done countless scans and found nothing...It is all due to the fact that Norton and McAfee are utter garbage.

 

So I was wondering, is there a way I could add something to detect if a user has one of those programs running and if so to display a message to them about it?

 

I realize that this is a weird question and the answer very well and most likely is no but I just wanted to ask to make sure.