Hello, I'm having a problem and hoping to find some advice here.
A couple of days ago, the Microsoft security scanner caught a virus infection (Trojan:Win32/Sefnit.A, according to Microsoft Security Essentials*). It was partially removed (I don't know what that means, whether a restart is required or the infection is gone but its traces and consequences on my laptop still exist..), after a little search I came across a cleanup utility for this virus so I decided to try it out.
There were 3 tools involved:
the first was a registry file, supposedly to disable the virus: I opened it with notepad and to my experience-lacking eye I cleared it as harmless (the entries involved corresponded to Firefox and IE which the virus actually infects).
the 2nd was an optimizer program which thankfully I noticed the name and looked it on WOT and didn't install.
So my questions are:
1) How can I delete the registry entries that I added?
2) How can I remove the infection completely?
Any help would be greatly appreciated.
*It's worth noting that Microsoft Security Essentials didn't catch it in a full scan a two days before I tried Microsoft Security Scanner (even though it states it's been in the database since 2011).