Its hard to say whats going on without viewing any logs from scans we need to run, what your going to have to do is to download some programs from a known clean computer and transfer them to the infected one by usb thumb drive.
windows 7 home security 2012 virus <– this most times has a rootkit involved and by removing the rootkit is sometimes messes up your internet connection
This is what we need to do.
You stated that your brother tried everything, what I need to know is exactly what programs he has run to try and remove this ?
Download DDS from one of the links below to your desktop
Link 1 Link 2
Double click the tool to run it.
A black Screen will open, just read the contents and do nothing.
When the tool finishes, it will open 2 reports, DDS.txt and attach.txt
Copy/Paste the contents of 'DDS.txt' into your post.
'attach.txt' should be zipped using Windows native zip utility and attached to your post. Compress and uncompress files (zip files)
Download aswMBR.exe ( 511KB ) to your desktop.
Double click the aswMBR.exe to run it
Click the "Scan" button to start scan [external image: Posted Image]
On completion of the scan click save log, save it to your desktop and post in your next reply [external image: Posted Image]
Download MiniToolBox and save it to your desktop and run it.
Checkmark following checkboxes:
List last 10 Event Viewer log
List installed programs.
List Devices. Select "All" radio button.
Click Go and post the result (Result.txt) that pops up. A copy of result.txt will be saved in the same directory the tool is run.