I used hitman pro once too.. it took me an hour to get it running and then four hours later it was still not done scanning. using one antivirus and one antispyware really works better than using 10 trial versions (that even scan one another's isolation folders) at a time.

Recommendations:

FIREWALL
-for powerful pcs: GData Internet Security (comes with antivirus and antispyware)
-for less powerful pcs: Norton Internet Security *currentyear* (comes with antivirus)
-for old pcs: NOD-32

ANTIVIRUS
-for powerful pcs: GData AntiVirusKit (comes with antispyware)
-for less powerful pcs: Norton Antivirus
-for old pcs: NOD-32

ANTI-SPYWARE
-for powerful pcs: Webroot SpySweeper
-for less powerful pcs: Webroot SpySweeper
-for old pcs: Windows Defender