I fear that the installation might be corrupted in some way. Have you already attempted to uninstall/reinstall VSE?
It could be malware, but likely not, since it usually will prevent the OAS from running as well.
If a reinstall (from a newly downloaded package) doesn't help, you might want to create a new user, and try logging into that account (making sure it's local admin), and see if it doesn't make a difference. Otherwise, you'll want to open a ticket with support, so we can dig into it.