As Peterr has said, regedit.exe does not contain any spaces in the application, which is located in C:\Windows\regedit.exe
Are you experiencing any other issues with other executeables on your system (any files with a .exe file extension)?
Sometimes this can be the mark of a malware / virus infection so you may want to hit your system with a couple good scanners.
Malwarebytes, SuperAntiSpyware, Spybot Search and Destroy, just google them and make sure you download the free versions, install them then update them with their respective most recent signature files. Then reboot your system in safemode and run a full scan of your computer with each. You should be able to run them all simultaneously.
Keep us posted.
Regards
Randy