Not much.
I think that the data from your user folder is broken. And a reinstall may not fix that (the uninstall may not delete the broken data, the new install will try to use it).
Saving your private key is a good idea, because whatever goes wrong, your money is safe. You should do that.

If you want to "save and restore", it works better / easier if you do that with (the correct) *.wallet file.