: Most modern software and updates for Windows 7 require SP1 . If your copy doesn't include it, you can often download the update manually from the Microsoft Download Center . For Operating Systems: Microsoft Windows 7 64-bit - eBay
(includes both 32-bit and 64-bit) for about $124.99. View various options on eBay . Specialty Software Retailers : Some sites like Sealevel list Windows 7 Professional 64-bit Go to product viewer dialog for this item.
(sometimes without keys) for around $22.50.
for $230.00, though availability for individual consumers may vary.
Since Microsoft no longer sells it directly, you can find various versions (New, Used, or Refurbished) on these platforms:
: This is the most common place to find physical installation media. You can find listings like: Microsoft Windows 7 Professional OEM 64-bit DVD Go to product viewer dialog for this item. for approximately $49.95.
: Ensure your hardware has at least a 1 GHz 64-bit processor , 2 GB of RAM , and 20 GB of hard drive space .