Have spent last 24hrs getting rid od trojans (~5; cryp.xpack.gen & dldr.cutwail.L.6 for example)- running Avira, SAS, spybot and ZA firewall but these all missed the trojans. I had to use combifix(?) and GWER (?) to get shot of them, my query is what program would/could have blocked them from infecting me PC? I now use Malwarebytes and 'noscript' add-on in firefox, will these do/help? Thanks in advance.
They all help but common sense is the best Anti virus/ trojan. WOT will help in firefox and IE8 if using a search engine. Not infalible but gives a general trend of how hostile or not a site is; click here
A warning if I may;ComboFix is about the one program to NOT use unless you are asked to while in a specialised HJT setting; you are fortunate that the computer is still running ; I guess you did not read the ComboFix disclaimer? click here
That said, do you have Avira, SAS fully updated/
Do you have Spybots Tea- Timer enabled? You also have Zone Alarm Firewall ( do you have Windows frewall too?)Could have a program clash going on
Have you yet run a full system scan with the updated Malwarebytes?