I got the windows 7 dvd and installed it on my computer. ( I previously had vista home premium) When I was done installing it I checked and I had 32bit OS. I wanted 64. How do I change it? And will it involve wiping my hard drive?

• Operating System – Windows Vista Home Basic
• License Type – OEM
• License Pricing – Standard
• -Easily find everything on your PC and the Internet

Product Description
Windows Vista Home Basic is the operating system for homes with basic computing needs. It is easy to set up, it helps you use your PC more securely and reliably, and like all of the editions of Windows Vista, it is compatible with the widest range of software, devices, and services that you use and trust. If you simply want to use your PC for tasks such as surfing the Internet, corresponding with friends and family using e-mail, or performing basic document creation… More >>

Microsoft Windows Vista Home Basic 32-bit for System Builders – 3 pack

• Operating System – Windows Vista Ultimate
• Languages – English
• Media – DVD
• Media Type – DVD-ROM

Product Description
When you want to have it all, choose Windows Vista Ultimate. It is the most complete edition of Windows Vista—with the power, security, and mobility features that you need for work, and all of the entertainment features that you want for fun…. More >>

Microsoft Windows Vista Ultimate 32-bit for System Builders

• Instant Search Technology
• Built in Security Features
• Windows Backup and Restore Center

Product Description
Windows Vista Business SP1 32-bit English for System Builders – 1 pack – with Free Windows 7 Upgrade Coupon… More >>

Windows Vista Business SP1 32-bit English for System Builders – 1 pack – with Free Windows 7 Upgrade Coupon