Thanks for the elaborate reply.
May I know the age of this laptop?
I cannot afford to replace this machine right now. Again it usually seems to be slightly more intensive things like videos or games, as well as occasionally with really busy sites like the weather channel with the map open, though that hasn't happened in months it did happen prior to replacing the drive the the first quarter of the year.
Seeing this part of your reply, I would suggest you to keep away from intensive tasks like the ones you already mentioned. You should either change parts one by one, or arrange to get a complete new one when you're prepared.
80 C sounds to high to me. Speccy - System Information - Free Download
is a good program to check the temp.
I will request a friend to come and take a look at your thread for more suggestions.