I have been having problems for about a week and I will try to summarize.
-Windows 7 Ultimate x64
-Windows resides on its own SSD ~ 64 GB
-(2) 6.0gb/s 2TB SATA drives - Applications & Media
First I got a notification about a week ago telling me my C drive was critically low. I had about 4 MB left of space. Turned out I needed to clean out my Downloads folder on my C drive and that freed up about 20+ GB.
No problems for about a day
Tried to download a very large file from the internet ~ 34GB (My download location for this download was specifically set to a different drive)
During the download the application could not store anymore temporary files on my C drive because it was full again.
Nothing was in my Downloads folder (C Drive) so upon some deep digging I located a folder under:
C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5
This folder was the culprit. It was filled with about 1.5 million files of various sizes, most were only 1KB, but no large files. The total space was about 25GB which was why my C drive was full again
I was not aware I had an infection but thought it was odd that that deep of a folder was gaining data, especially since I don't even use Internet Explorer.
After deletion of the files inside the folder I ran some scans. I use Microsoft Security Essentials and I've downloaded Malwarebytes.
Both came back with traces of infection, some were backdoors, some were trojans. I quarantined, then deleted those files and everything seemed to be working fine except the previous folder mentioned is still filling up with data and after several scans my computer is not finding anything.
I ran some other tests (Including Combofix....whoops) and found myself getting bootloops (Windows would boot but immediately Blue Screen) however I was able to log on as a different user and could work the computer fine. I then obtained a copy of a windows 7 Ultimate so I could boot up and try to repair the issue. It said there was an error in Windows Recovery, automatically fixed it then booted up.
I am currently on my main User account (No blue screen yet, been on about 15 min) however my Outlook now just goes to "Not Responding" when I try to open it, so there is definitely still something wrong on my machine.
Like I said if it comes to a reformat and reinstallation of windows it isn't the end of the world because my Windows is on its own drive.
My next independant step would be a reformat and reinstallation, but I really don't want to have to reinstall all of my drivers and re-link all of the paths to my application installations.
Thanks in advance.