Personal server reinstallation

Where are you seeing it? What is it stopping you from doing?

Have you ensured that any cf odbc service is stopped? Look in task manager (in the details, if offered) for any processes named slserver. If you right-click and choose properties, and they are in the cf folder, choose end task for them, then try again whatever you were doing.

Btw, ate you really using an odbc dsn in cf? Sometimes people find they are not, so then can just stop/disable the cf odbc services (and be careful not to choose them in their next cf installation). 

Finally, if you really ate using an odbc db, in the year 2021, maybe it's (past) time to reconsider. Even for a personal server, any of many free alternatives would be so much better, technically and even for the sake of your career. There are free versions of whatever db you may use at work, which could be a plus to enable for personal use. Or learning a new one could be a real plus. 

But again see my first comments if you are determined to "stick with what you know".