See Replace Your Preferences to find the TWO folders where your prefences are stored. If you don't know how to show hidden files and folders on your OS you will need to Google that to learn. Once you locate the folders, rest the permissions to allow read and write access to everyone.
Since I can't get InDesign to open at all, this information was not helpful.
Nothing in the above answer requires that InDesign be open...
But tell us the OS, the version of InDesign, and the exact error message you receive, and maybe we can offer more help.
Unfortunately I'm on a PC (Lenovo T440s)
That does not really answer the question about your Operating system.
The link shows Infos also for some Windows Systems. Did you try to delete or rename those files?
"Unable to launch Adobe InDesign as you do not have sufficient permissions to access the preferences folders. Ensure that you have appropriate permissions and then restart Adobe InDesign."
This error Message seems to me like you don`t have writing rights on one or both of the Folders. Did you check this?
Does it change anything if you try to open InDesign with Administrator rights?
OK, that model could have shipped with Windows 7 or Windows 8 and to the best of my knowledge should be compatible with most versions of ID you would likely be trying to use. We do, though, really need to know the version Windows, and of InDesign, and whether this is a new installation that never worked, or if it suddenly stopped working.