If you tried to scan with two Antivirus on MacAfee and F-secure then probably what happened was F secure found MacAfees virus list and declared them as "false positives" and thought you had problems.
You should only run with :
1 software firewall
1 Malware scanner in real-time
1 backup scanner
and a blocker (Spyware Blaster)
If your bank is giving away free Antivirus software (a lot do) then use that (they then cannot argue if you have a problem).
Only use Antimalware recommended by someone who has used it there are some rogue programs masquerading as real out there.
This thread tells you all you need to make your PC / laptop safe click here