Download the corresponding edition of Windows 7 you have a license for from the following link. You can identify the edition on COA sticker attached to your machine, with at bottom or battery compartment (laptop) or top/side if its a desktop computer.
COA Certificate of Authenticity:
http://www.microsoft.com/howtotell/content.aspx?pg=coa
What is the Windows Certificate of Authenticity?
http://windows.microsoft.com/en-US/windows7/What-is-the-Windows-Certificate-of-Authenticity
• Windows 7 Home Premium (x86)
- 32 bit
• Windows 7 Home Premium (x64)
- 64 bit
32 vs 64 bit
http://windows.microsoft.com/en-US/windows7/32-bit-and-64-bit-Windows-frequently-asked-questions
Is my PC running the 32-bit or 64-bit version of Windows?
http://windows.microsoft.com/en-us/windows7/find-out-32-or-64-bit
http://windows.microsoft.com/en-US/windows7/Installing-and-reinstalling-Windows-7
ImgBurn - In addtion to supporting the creation of CD's from .ISO files,
it supports a wide range of other image file formats, and it's free.
(BIN, CUE, DI, DVD, GI, IMG, MDS, NRG, PDI and ISO)
http://www.imgburn.com/
http://neosmart.net/wiki/display/G/Burning+ISO+Images+with+ImgBurn
Note: Always use the slowest burn speed (4x or 2x) if offered a choice.
