Hi
Just don't know what to suggest, as you are using 64bit the files should be under the Program Files (x86) /Corel folder.
When searching, some files are hidden, you must select to show hidden files and folders to locate all files.
When you try to install, the file is extracted to a temp folder, for my pc it was here:-
C:Usres/User Name/AppData/Local/Temp/Corel Video Studio.....
These are used to install the program
After installation these files are deleted, if installation is terminated these files may not be removed.
Can you check the location, if they exist clean the temp folder, then try to re-install.
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Have you considered a System Restore to before your lunch break
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Just noticed the other post
Try using these details first.... 000005468-Uninstalling VideoStudio Pro X4