The day took an unexpected twist when I called Microsoft to use my buddy's hard-earned $99 for one-incident support for 30 days, his call.
Notable was the discovery of additional infections, and the remote support tech used numerous apps to eliminate them while also 1) verifying no rootkit presence; 2) uninstalling much of the bloatware eroding the system's performance; and 3) restoring the CD/DVD to a drive letter in Computer and an appearance in the Device Manager. Regardless of whether I could have done same, my suspicions are not necessarily gone after the 90-minute call, so I'll further investigate some of the "irregularities" I've already noticed.
I'll blame my 3-day outage due to my eye surgery for the change of heart on his part, and I will use an old desktop of mine to practice *all* of the steps outlined in the tutorials, which I kind of suspected I would end up doing anyway. Fixing a friend's cyber-problems has its rewards no matter how long it takes, as in my previous topic of a dual boot, so this project ended up feeling like a no-closure affair, which will probably dictate a lack of enthusiasm on my part in resolving future computer issues, unless they're my own...
Thanks to all who gave of their valuable time and used spot-on resources to assist me, for sure.