How to delete a file? In Windows Explorer right-click on it and choose delete. That's rather basic us of Windows.

I see the whole Works calendar application in a sub (or maybe subsub) folder of Program Files. The same trick as I mentioned to delete a file works for a folder also.

After deleting those files you might get a 'file not found' error when Windows tries to run the program when you boot. That's not serious, but it's easy to do something about it.