Hello there,
Running MS Paint as an administrator is the first step to resolving any MS Paint-related problems. Some system files restrict Windows programs from functioning properly. As such, running the file as an administrator enables it to access files that would usually be restricted.
Having piles of cached data on your system is likely to cause you problems. Therefore, let's clear its cache before implementing any other fix. To clear Microsoft Store's cache, open the Run command by pressing Win + R. Then, type WSReset.exe and hit OK. This process may clear Microsoft Store's cache and restore its normal functionality.
Hope this resolves your Query !!
--If the reply is helpful, please Upvote and Accept it as an answer–