Microsoft Essentials gives clear at all, but I got Trojan.Dropper & Trojan.Killav!

I think I was the subject of some kind of attack in line on Friday night.  I am the only user on this pc but I created another account as administrator I read somewhere it was safer to work that way! I have always relied on Microsoft Security Essentials, but as shown in the following, I may need to use anything else.

In my second account - (the one I use all the time) - I ran scan Microsoft Safety who gave me the fire. I updated Microsoft Essentials and run - everything is OK. So the free version of Malwarebytes anti-malware and upward came "Trojan.Dropper. Malwarebytes anti-malware quarantined it & then I deleted it. I ran it again the Microsoft Scanner and still nothing. I started to uninstall all the programs that I have not used for a few months and during one of the removals, appears Malware Bytes to say that he had taken Trojan.Killav. So I dealt with that. I ran the scanner from Microsoft again and again once he gave me the fire. But I'm not alone - metaphorically speaking - on this pc. What should I do, please?

Upgrade Windows XP to Windows 7
Step by step: how to 'Upgrade' from Windows XP to Windows 7

Of course, you can always reformat and reinstall Windows. If you do not know how, please refer to the clean XP install an Interactive installation

ATTENTION: According to the infection, reinstalling Windows without first wipe the entire hard drive with a distribution and/or a format not always remove all malware. The resettlement only replaces the Windows files. Malware on the system will always be there later.

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