Hi
Glad my additional info. fixed the thread title.
Yes, I checked the Installation thread before posting my question on here (but couldn't find anything on this, hope I didn't miss anything!...)
I noticed the paint.NET installation file I downloaded was a new version, only a day old, so I thought it may have been a new problem associated with the new download file & that there may be a fix for it now.
I did try downloading both paint.NET & .NET framework again, but perhaps I should give it another go?