UPDATE ON PHOTOSHOP PRESSURE SENSITIVITY ISSUE!
Problem fixed!!
Hey, so for those who have encountered similar issues with Photoshop CS5 on the Surface Pro 7 and have been following this thread for some answers, I thought I would continue my findings on the matter till I found a resolution.
Well can happily say that a resolution to my problem was found!
I'd had enough of trying an failing to fix the problem at home and had pretty much exhausted any and all knowledge I could glean on the matter, so I took my Surface pro 7 and the pen back to the store where I'd bought it and secured an appointment with a member of their tech "Knowhow" support team.
After he had tried a few things and discovered that not only were Photoshop and GIMP not responding, but microsoft's own software Paint 3D wasn't behaving as it should with the pen's features! I had missed this as I was focused on trying to get Photoshop to work as priority.
It was surmised the the fault lay in the Surface's hardware and not in the pen's communication with the software I was trying to use. We tried a different pen on my Surface which seemed to confirm the fault with the Surface itself.
So I was given a new Surface pro 7, and returned home to repeat the process of setting it up, installing all system updates, installing Photoshop, fixing the tiny icon problem with the UI manifest as provided by Barb (thank you again for that fix!), AND THEN after also installing the 32bit and 64bit wintab drivers we finally have pen pressure sensitivity in Photoshop CS5!!!!
Thank you again those who offered advice and support! It was greatly appreciated!