I suggest that before doing what I'm suggesting below , using a different non-infect PC/Laptop>>> Go to Google >>> do a search on the "Security shield anti-virus" and you'll find tons of forums that will walk you thru how to get rid of this. Keep in mind the file name like sdfertweg.exe keep changing but the underlying malware is the same

The fix recommended by Jamos will not work in this situation either.Its sitting in the registry and will continue to change its .exe name to XXXXXX.EXE every time the system is rebooted.My laptop was infected by a similar.Its a root-kit virus and these are particularly nasty. The good news is, its not all gloom and doom.

FYI - in addition to Malware bytes that s mentioned below,you will also need a Registry cleaner that will first delete the malicious registry entries.Any of the forums that you find after the Google search,that have a walk-thru of the fix will also have a link to the Registry cleaner required. So that said.....

1) Go to download.com ( or CNET.Com and then the downloads section)
2)Download Malwarebytes software.
3)Install it and run the update first to update its malware definition list
4) Once installed- run a FULL system scan with all diagnostic options within the software turned-on.
5) Once the scan (which may take a couple of hours)is compete ,and it presents the list of virus's/malware if found just follow the default steps recommended by Malwarebyte to delete them

All of the above should be done in safe-mode.
I'm not a I.T guy but these were the steps I followed to get rid of the infection.

Once again....you will need to find the registry cleaner that will specifically delete the malicious registry entries in addition to Malware Bytes.