Great Stuff Frank,
and glad this helped.... Just as an FYI, after my last post, the app did continue to disappear from the Accessories folder but I found a program which is Freeware called System Protect - here's the link -
System Protect Help & Support - Free File and Folder Protection
I downloaded and added the folder for system restore from 'roaming' and it has not disappeared since - the same with a couple of other files I put in there.
This program apparently protects your files from any unauthorized changes and alerts you if something/someone tries to make a change - you can also customize it to protect specific files.
Like I say, the restore app has not disappeared since and as the 'system-protect' app is absolutely free - there's 'no harm, no foul'... it's all good -take care, Sean