Hi I am purchasing a new PC and don't want to buy Windows 7. I've downloaded the iso. file for Windows 7 ultimate but then don't know what to do as there are soooo many options on the web. Firstly I wanted to put the Windows 7 on a USB as the DVD burner on my laptop doesn't work. Secondly, what do I do when i switch on my new PC to install Windows 7 and how do i activate it? I did try looking at previous posts but they're really confusing and don't give ALL the information. Please help. I'm not really good with technical stuff so simple words please, for example BIOS is mentioned in a lot of place! And maybe someone knows a guide with screenshots? Also the PC is custom built from Chillblast so not an OEM. Thanks. Maddy.