Amazon is offering a Windows 7 Home Premium upgrade for $115. Best of all, you can legally install it on up to three computers. If you happen to have three, that drives the price per computer to under $40.
However, I would suggest you carefully research the minimum system requirements for Windows 7 as your older computer might not meet the minimums. Windows 8 will require even more computing power to run properly.
NOTE: With almost all operating systems, including Windows, the stated minimum memory requirements are just that: the minimum. It will run slowly with that amount of memory. For satisfactory operation, you will probably want to install double the minimum amount of memory.As of this moment, Amazon is selling Windows 7 "Family Pack" (which allows you to install Windows 7 on three separate PCs for 1 low price) for $115. Normally, the price is $149.95, but since Windows 8 is due in October, there's a rush to sell off stock. To make this offer even better, Amazon is also offering free shipping.
You can find this upgrade offer on Amazon.com at http://goo.gl/UvdII
This price is effective now and is subject to change according to Amazon policy without notice. In the past, Windows 7 Family Pack has sold out on Amazon in a matter of hours when it's priced this low. The software is available as I write these words but I have no idea how long it will last. I suspect that once Amazon sells out the curent inventory, the reduced price will not be repeated.
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