So a few days ago, i think Monday, I found a virus on my computer. Not a great end to the year, and since I still have not been able to get rid of it, not a great start to the new year either.
I realized I had a virus when I heard sounds in the background even though there were no processes running and I tried a few different things.
I immediately went to safe mode scanned the computer with a few different programs, including tdsskiller, Malwarebytes anti-malware, rootkitremover, cureit (Doctor Web?) and ComboFix (probably shouldn't have). As you can imagine there was a lot of desperation involved. So the programs found some infected files and either deleted them or did whatever they wanted to do, but the problem has persisted.
I did a system restore, even though i was very skeptical to do it thinking it wouldn't do anything and may actually cause more harm than anything else. I did that before new year's eve, restarted the computer, and everything seemed fine, no ads etc, so I went out to celebrate relieved and without worries (yay), but then came back the next morning and found out that the problem was not gone, which made my headache even worse.
At one point when I was in safe mode with networking a message showed up that the computer will shut down in one minute. It did. This happened only once in that instance.
I am logged in from my laptop, and I changed all my passwords online soon after I found out how annoying this thing was. So probably tuesday.
I just ran Malwarebytes antirootkit in safe mode and it has not found anything. I am actually logged into the other computer, but I'm disconnected from the internet. No audio ads yet, but since the system restore I ran multiple different scans and they did not find any infections after the initial scans, so I doubt the problem is solved.
I'm going to reinstall the windows tomorrow, but only repairing it and not doing a full clean installation, I would rather avoid that if at all possible - as I'm sure anyone would in this situation.
By the way:
I have Windows 7 on the infected computer.
I use AVG 2012 as my main antivirus program.
So if I do that Windows installation what are the chances that would help?
And if I end up cleaning the whole system I would like to save some files, so what types of files are most likely to carry an infection and which are the least likely (.docs, .jpegs)?
Also, this is hopefully unrelated, but the internet speed has drastically decreased on my (hopefully) healthy laptop at some point today, I have no idea if it was caused by something or if it just happened out of nowhere. This laptop is at about 0.5Mbps both download and upload speeds, while the infected pc is a lot faster, about 10 and 5Mbps.I have not had the time to look into it, but how could I find out if this is caused by a potential virus? Can a virus spread through a network? And I am not sharing anything with the other computer and never had.
So far the infected machine seems to be alright, but I want to be a 100% sure.
This is the first virus I have not been able to deal with, or maybe I did and this is just paranoia. Doubtful.
Sorry for this little mess I wrote here, please ask me any questions if you want me to clear something up or if you want other information.
If anyone can help me, I will love you forever, I can also refrain from expressing that love if you so desire.
I think depression is slowly starting to kick in now.
A very, very sad guinea pig.