This computer is more than 10 years old and has been used by three people, so it has accumulated years of files and installed programs. It is now having problems, and I'd like to wipe it and start fresh. I have another storage device available for backups, but I'm not sure which files are safe to move or whether some programs need special handling. What should I back up, what should I avoid doing, and would I be better off asking someone experienced to help?
3 Answers
Don’t assume a factory reset will install a modern version of Windows. Older computers may restore the version that originally came with them, so you might need current installation media instead. Afterward, install drivers and updates, then reinstall applications one at a time. If the hardware struggles with Windows, ChromeOS Flex or a lightweight Linux distribution could be worth considering for basic browsing and office work.
Before wiping anything, make a list of every Windows user account and back up the contents of each person’s Desktop, Documents, Downloads, Pictures, Videos, browser bookmarks, and any application-specific data. Don’t try to move installed programs by copying their folders; most will need to be installed again afterward. Also record the programs you use, locate their installers, and check whether any paid software needs to be deactivated or have its license key saved first.
The cleanest approach is usually a fresh Windows installation rather than manually deleting files. If possible, replace the old hard drive or SSD and keep the original drive untouched as a backup. An inexpensive USB-to-SATA adapter can let you copy files from the old drive later. If you use the existing drive, use Windows’ Reset this PC option and choose Remove everything, but make absolutely sure your backups work before starting.

Because the machine is over a decade old, check its hardware before choosing a Windows version. Windows 11 may not officially support it, and even a clean installation may still feel slow if it has an old hard drive or limited RAM.