Amateur,
You may have better success by deleting all files and folders via a dos prompt.
To do this you’ll have to re-boot your PC in dos mode and delete the files from dos, not Win.
Using Safe mode or a dos prompt from within your Win OS wont work!
As far as the registy entries. I’m hoping you have a backup of an earlier version of these. Te you can simply do a roll back and everything should be cool.
As a side note. This is very good example of why you should take a registry backup before installing unkown software 
Let me know if this works for you Amateur.
Cheers