It depends on what system you would like to upgrade to, you can check up the options at Amazon here is another option for a few extra dollars you can get
Microsoft Windows 7 Home Premium Upgrade Family Pack (3-User)
This Microsoft Windows 7 Home Premium Family Pack allows users to install Windows 7 Home Premium on up to three PCs in a household that already has Windows Vista or Windows XP installed. If you’re not running Windows XP or Windows Vista, you’ll need to purchase the Full version of Windows 7.
Microsoft Windows 7 Home Premium Upgrade
Not sure if you need the upgrade version or the full version? You can purchase the Upgrade version of Windows 7 if you're currently running Windows Vista or Windows XP on your PC. If you're not running Windows XP or Windows Vista on your PC, you'll need to purchase the Full version of Windows 7.
Product Features
- (Includes 32 & 64-bit versions cd-rom) Combines remarkable ease-of-use with the entertainment features of Home Premium and the business capabilities of Professional--get it all with with Windows 7 Ultimate
- Make the things you do every day easier with improved desktop navigation; start programs faster and more easily, and quickly find the documents you use most often
- Run many Windows XP productivity programs in Windows XP Mode; watch, pause, rewind, and record TV on your PC
- Easily create a home network and connect your PCs to a printer with HomeGroup; connect to company networks easily and more securely with Domain Join
- Recover your data easily with automatic backup to your home and business network; help protect data on your PC and portable storage devices against loss or theft with BitLocker
