Do You Know These Symtoms?

As an adninistator; my account is running much slower than general user accounts. I have had attacks that are attempting to re-establish domain. “AVG Free” is running uptodate and passes a front/open virus approach.
At present: have had to delete two accounts. First account was successful; second account is NOT – this is the account that has hosted all the viral attempts.
@ Current; this is a “stand alone” machine and is un-networked.
I’m Lost…………..