New
#11
I am not a fan of Windows 10 (not just the privacy thing, but other reasons), I like 7 and 8 (with a 3rd party menu).
However, if you upgrade you can try it for awhile (1 month) before the upgrade is permanent. It has a restore to previous version option available and works without a hitch. If you go beyond the 1 month then you will have to reinstall your old Windows 7, via disk or OEM disks, if I am not mistaken.