Figured out one solution to fix problem of Winamp 5.8 preventing Windows 10 (Home-version 64-bit) shutdown.
The problem lies within the official 5.8 beta release:
- If you have 5.8 installed, you must install Winamp 5.666 over the existing installation of 5.8.
After that, install 5.8 again over the 5.666. This will fix problem with 5.8s problem.
- Or if you have no Winamp installed currently, install 5.666 first before installing 5.8.
This solution has worked both for my PC and laptop. Hope anybody else finds this solution working for them.
Winamp 5.666 is still available for download at
http://forums.winamp.com/showthread.php?t=373755