Yes, with the caveat that you go through the directory and make sure nothing you need is still there. You won't lose Windows 10 by keeping that folder, though. Windows 10 is on your computer to stay, unless you choose otherwise.
Computer Type PC/Desktop System Manufacturer/Model Number Home built desktop, Toshiba laptop, Dell laptop, MS Surface Pro 3 tablet OS W10 Pro (desktop), W10 (laptop), W10 (laptop), W10Pro (tablet) CPU i7 desktop, i7 laptop, i5 laptop, i5 tablet Motherboard ASUS Memory 16G desktop, 12G laptop, 8G laptop, 4G tablet Sound Card built-in
Keyboard LogiTech Mouse MS bluetooth Hard Drives 240G ssd for OS, 1.5T, 2T & 4T for data in desktop, 500G ssd in Toshiba laptop, 250G ssd in Dell laptop, 128G ssd in Surface Pro 3 tablet Internet Speed 120Mbps down/8Mbps up Browser FireFox Antivirus MSE Other Info Built my first computer in 1986 (8Mhz 8088 cpu, 640K RAM, 20M HDD, 2 360k FDD) and have been building them ever since for myself, family and friends.
Once your W10 is activated you can do clean installs etc as many times as you want for THE LIFETIME of the computer you are using.
You can go backwards and forwards from W7 / W8 / W8.1 as many times as you like -- forget the windows.old file --just take backups using Macrium / Acronis etc.
Proviso: Your OLD Os must have been activated WITH LATEST UPDATES installed -- AND the INITIAL W10 install was an UPGRADE. After that you can clean install etc etc -- even wiping your entire HDD and re0installing W10 will still leave it activated (just SKIP when prompted for a key).
After July 2016 you will no longer get the free update.
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