Cannot run Computer Disk Management

Hello all,

I use Windows 7 x64. I usually run Disk Management on the right-click My Computer\Manage.
But after installing Paragon Hard Disk Manager 15, there's an error.. why?? So weird.. previously it's running well before install it.

What happened.. the pop-up says like this:
This file does not have a program associated with it for performing this action. Please install a program or, if one is already installed, create an association in the Default Programs control panel.

Please suggest me what should I do? Thanks in advance.

1. As I suppose the extension .msc lost the connection to it's default program. However that happened, you should be able to recreate this connection by rightclick on (for example) C:\Windows\System32\diskmgmt.msc, select "Open with", select "Microsoft Management Console".

2. And: No - the installation of a Paragon program is not at all a possible reason for that issue. This has just been a random conincidence.

Hm.. Maybe I'm mistaken there have deleted some system files in %Local AppData% previously.
It's okay, but now I've been doing recovery via System Restore on a date before installing Paragon.. Thanks for your help and replies.