Image your disk, this good advice come a bit late for me. All I've read about the upgrade reassured me all would be easy and may take a few moments. I may be stuck guys and I need your help. The day before 10 was available, I deleted Carbonite with the reassurance Google Drive would do the same thing free. Now I read the words Image your disk and fear enters.
I proceeded with the 10 upgrade and 7 hours later my computer seems to be "stuck" at 87% progress. Im uncertain what should be done.
will running constant harm my computer?
will turning off computer wipe out Win 8.1(current) or delete win 10
If the PC has been running for 7+ hours "stuck" at 87%, it's likely "frozen" and won't do anything more without human intervention. Since the PC will likely never "unfreeze" itself, you may have no option other than to hold down the PC power button to shut down the machine. Then power it back up to see what condition it's in. The Win10 install may just pick up where it left and continue the installation. Or, the boot process may give you the screen indicating that Windows was shut down abnormally and give you options for how you would like to boot up, e.g. normally, safe mode, or safe mode with networking. If you get that option I would try safe mood just to see if I get a desktop. Then I would do a restart to get your previous version of Windows running normally. Again, this assumes that the Win10 install aborts and the PC "reverts" to your previous version. Otherwise, the Win10 install may continue and complete normally. There is always that hope. In any event, you'll likely have to shut the PC down manually in order to determine where you stand.
If, while running your previous version of Windows, you used the Windows feature to periodically create "restore point," then it might be possible to restore your system files to a previous state of as a known date, specifically, the date the most recent restore point was created. If after power cycling your PC you get your previous version of Windows back, you may not need to use a restore point to get your system operating files back to where they were as of a given date.
Also, if all goes badly, you could reinstall your previous version of Windows from your DVD install disk or restore media (if you created them). And since you had a subscription with Carbonite, you might call them and explain your situation. They will likely have a backup of your backup (sound redundant...) on file and would let you reinstate your subscription so that you could access your backup files. Hope that helps.