Hi guys, I emailed Microsoft support this question and got a useless answer back; they just sent me a link to download the Windows 7 Upgrade Advisor, which basically told me what I already knew (that my system is capable of running Windows 7). So I called them just now and the so-called "tech support" person wasn't much of a help either, she didn't seem too bright and didn't know much about the whole upgrade process, giving me conflicting information. So, I hope someone on here can answer this for me. I recently bought a new laptop that came pre-installed with Windows 7 Home Premium 64-bit. Then I found out that Home Premium does not have "XP Mode" capability, so I used the Student Discount offer to buy Windows 7 Professional 64-bit (full version not upgrade) from Microsoft's website for $29.99 (what a bargain!). Can anyone tell me FOR SURE, whether I can do just an upgrade (where all my manufacturer's pre-installed applications, drivers, and all my currently installed applications are preserved) or if I MUST do a clean install (reinstalling all of these applications, etc.)? Thanks in advance!