So I had a previous version of SW installed on my computer and tried to delete it and wasn't able to get everything apparently; after installing the newer version with the license, there was a conflict and I tried deleting both.

I tried uninstalling it and all related files so I can reinstall it, but I keep getting the message that it is being used by another program (which I am not able to find in task manager).

Furthermore, when I tried reinstalling from the CD, I get the message

"Installation project error: The project file does not exist (C:\Windows\SolidWorks\IM_20120-40200-1100-100\sldim\)

Notify your administrator. {14000}"

In addition, I am unable to select "individual installation" in the installation manager anymore, so I cannot try reinstalling things from scratch. My guess this is due to leftover files that I am unable to delete due to other programs using them, that I am unable to find.

Does anyone know how I can get rid of these leftover files, so I can finally install Solidworks properly?