Sometimes it’s best to purchase a new computer and other times it’s not.
If you happen to have a newer machine with Vista or even an older machine with XP, these can often times be upgraded to Windows 7 or even Windows 8.1
Driver availability is the biggest issue when upgrading your Operating System if your computer is several years old.
If an upgrade is possible, I can get the Operating System for about 1/2 of what you’d pay retail.
Call for details and see if your computer OS can be upgraded.