Thank you to all. It's been a frustrating experience, but I think I have the answer now. Yes, it has taken several weeks to figure out, but I owe it to all the thread readers who may have this issue in the future, to try this.
Everything continued to be choppy. I could not insert sound clips exactly where I wanted, the sound would not match up with choppy video, the video would not play smoothLy......and I blamed it on the program ALTHOUGH I HAVE USED ROXIO FOR YEARS WITH FEW ISSUES! Then, the rendering took forever! I mean, a 30 minute video could take 4 hours to render. So by chance, I noticed that my laptop was hot. I stuck it in an empty freezer to render, and it sped up dramatically. I took the back of my laptop off, to see if there was a bunch of dust. No there was not. So dust was not clogging my fan or anything else, it did not appear. It seemed overheating was the culprit. So on to Aliexpress.com for a nice laptop tray fan, which took about three weeks to receive from China. Just hooked it up. 5 fans blowing. Low and behold, with the fan on (and even though my laptop had been running all day).......drum roll........... the Roxio editing is no longer choppy!!!!! So, those searching for an answer, I suggest the issue is NOT with the Roxio program, but rather, my superb three year old Dell I7 laptop is getting up in age, and developing overheating issues. The fan corrected the issue and the program performing as it has in the past. I probably will still run down to MicroCenter and have them clean the insides of my computer out, and put some new paste on the fan (google it - I know nothing of this other than some sort of cooling paste becomes brittle with age and needs to be replaced.)
THANKS TO ALL YOU KIND HELPERS AND EXPERT OUT THERE. I AM NOW ONE PLEASED LADY.
SPECIAL SHOUT OUT TO MESSRS. HARDIN AND SKNIS!!!! THANK YOU ALL!