Common questions:
It isn't uninstalling normally
If the sponsor no longer uninstalls properly unless you are in safe mode, this can be caused by a broken Internet Explorer it sometimes leaves running in the background. If this is the problem, starting in safemode will solve this.
Why do I need to reinstall it?
The sponsor program will not uninstall if any component of it is modified in any way. This is a security measure. In order to properly uninstall, you must reinstall it first to make sure all of it's files are there and it won't react to missing ones
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