You have a  Trojan virus  on your PC – IOSDT.EXE is its main file.   You most probably tried to download illegal copies of Microsoft software, and got infected by this trojan virus as a result (it gives access to your PC from the Internet).
 
Recommendation :    
Reboot your PC into Safe Mode and then do a search for all files and folders which start with  IOSDT  and delete them.  Next, empty your Recycle Bin and reboot back into Normal Mode