Hi Julie Carney,
Since this is a brand-new Surface Pro and multiple built-in apps appear to be affected, I'd also recommend testing with a new user account to help determine whether the issue is related to the current Windows profile.
Go to Settings > Accounts > Other users > Add account. Select "I don't have this person's sign-in information", then choose "Add a user without a Microsoft account" and create a temporary test account. After signing in to the new account, check whether Microsoft Store, Snipping Tool and JPG/PNG files open normally.
Additionally, please let me know whether you set up the device with a Microsoft account or a local account and whether you're seeing any specific error messages when trying to open these apps or files. That information may help narrow down the cause.
Please keep me updated on know how it goes and I'll be happy to continue troubleshooting if needed.
If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.