I would recommend to do system file check using this SF tutorial
, maybe there is something else missing too.
To get the file for Windows 7 32bit Ultimate:
You can download it from here
, for example.
Never mind that website is in korean, just look for word "Down" in the middle. That is a download link.
After downloading this file, check it for viruses with something like https://www.virustotal.com/
Virustotal will give you checksum for this file.
For Windows 7 32 bit is should be
(All three is the same thing in different algorithms)