yep that's what i want to do except i won't delete folders manually just use the uninstall function
That won't do anything. No need to uninstall. Uninstalling does not touch any of the Bitcoin Core data so it won't make a difference if you uninstall and reinstall. Go to the Bitcoin Core datadir and delete the folders named blocks and chainstate or rename them to something else. The path to your datadir is listed in the Debug Window (Help > Debug Window).
Backup your wallet.dat file which will be found in the datadir as well.
When you do all of this, make sure that Bitcoin Core is shut down.