Hi Fahad,
Have you managed to resolve those pop-ups by applying the latest Rapid Release definitions and performing a full system scan on that computer, preferably in safe mode?
What threat was detected on it? Until the email-sending threat on that computer is identified and removed, I strongly recommend keeping it isolated form the network. There's already enough spam in the world as it is! :)
Final note: after the computer has been cleaned, make sure that you are running SAV 10.1 MR8 or MR9. Those latest two releases contain very important improvements that will enable SAV to work efficiently with today's large definiton sizes. Older releases can encounter trouble from time to time.
Thanks and best regards,
Mick