This is a problem we see often in these forums. Because the typical cause for it is malware related we must always refer users to the malware removal forums.
If you'll allow me though, I'd like to try a new way of fixing this problem. Because you seem computer literate I believe it'll be easy.
Please go to KZTech's Download page
and click on the download button underneath System Repair Engineer 184.108.40.2061
to download a zip file.
Extract the zip file to a new folder. The archive includes several files.
After doing so, go open the folder in Explorer or My Computer. Go to "Tools" and select "Folder Options" to open the folder options applet. Click on the "View" tab and in the options provided find and uncheck
the box next to "Hide extensions for known filetypes." This will allow you to see the extension types of every file in the file's name (.exe, .doc, .txt, etc.)
In the folder into which you extracted the files earlier you will find one called SREngLdr.exe
. Right click this file and rename it to SREngLdr.pif
. You will get a warning asking you if you really want to do this, say Yes.
Then double click on the file to run it. You might get some errors on the right hand side, just click on the "Ok" button to get rid of these. With the program opened, click on "System Repair" on the left hand column. You will get a list of file associations on your computer and their status (either Normal or Error)
Check the box next to any file association that has the "Error" status and click on the "Repair" button on the bottom right.
You can then close the program. Your problem should be fixed now.