To all who replied, I thank you!
As Gmail Notifier had hijacked all apps and progs that I tried to open, it was not possible for me to use its uninstall feature to rid myself of it. Each attempt merely open the Gmail Notifier program. But, it is now 'no more' on my PC.
I also posted my dilemma at Annoyances.org
and the solution was found there after Borg replied to my plea for help.
Borg's link led me to the answer/solution. Having followed the 'read this' link, I went thru all the instructions provided, but still could not resolve the problem. That is until I got to the section headed "One Last Thing To Try
I recreated the .exe extension in Tools | Folder Options | File Types
Tab. I then had to open the File Types dialog from any Explorer window (Tools | Folder Options | File Types
Tab) and scroll down to where .EXE would be in the alphabetical order and made certain .EXE was not there ( or if it was, then fix it there). Finally, I selected the 'New' button, typed in EXE for the extension and selected the Advanced button. From the list, I picked "Application
." I then clicked OK and closed the Folder Options window and, hey presto, control of my machine was restored to me!!
I then made sure that I uninstalled Gmail notifier and - touch wood
- all seems to have run well since then!! All my apps have been restored and access to all my programs regained.
Hope this helps anyone who may have suffered the same fate?! I'm off to print hard copy for future reference, should another prog attempt PC hijack?!BE PREPARED!