New member/poster here. I must admit that I am not all that computer savvy, though I use a computer a lot at work and at home.
Now, the reason for my post, but first a little background...
I just purchased a fairly new (but used) Dell vostro 270 off eBay. The seller said it was used only a brief time and he reformatted the drive and reloaded the Win7 OS and all drivers. Got it on Wedneday afternoon (04/09/14) and it was working fine. I downloaded the free AVG antivirus, which is what I had on my old PC. I loaded my MS Office 7 and printer software.... so far so good, and working great. Next, I decided to download new newest edition of the free Malewarebites as an added security precaution; this is when the problems started, big-time.
After I downloaded Malewarebites and ran the first scan, it said there were several bad files... and deleted them. I rebooted and then could not log on to the internet, in either Foxfire or IE. I would get an error message like "Proxy server not recognizing user" or something like that. In my panic, I attempted a system restore, to no avail, apparently. At first the system restore had an error message saying I needed to disable my antivirus. In the meantime, I uninstalled Malewarebites because I figured that is what caused the problem. After several attempts to do a system restore, which I don't think was ever successful, I gave up.
I have a lap-top that I use sometimes and connected it my modem and had access to the internet. So, I googled the problem about no internet after downloading malewarebites. I found several related topics and read about the Combofix solution. I downloaded Combofix to my flashdrive and ran it on my new-to-me PC. That fixed the problem and I was able to get on the internet once again, but some questions still remain...
After I could once again get on the internet, I re-enabled AVG and ran a scan... it picked up what it said was trojan virus and eliminated it. I'm not sure if that was related to the Combofix scan or was there all along...
Now, my questions for you experts... what happened when I downloaded the Malewarebites and ran a scan that messed up my PC internet? If there was maleware on my new-to-me, freshly formated and reloaded OS PC, why didn't AVG pick it up early on? Should I uninstall the Combofix program and related files? Do you all think my new-to-me PC still has maleware on it? It is safe to use?
At the moment, I'm confused and irritated. I thought about taking my PC to the local computer shop and have them check it out... don't guess I saved any money on this one.
Thanks for any help!! By-the-way, I can post the Combofix scan/log if needed.
Edited by hamluis, 11 April 2014 - 02:59 PM.
Moved from Win 7 to Am I Infected - Hamluis.