There is no CD/DVD's included so everything is stored on the harddisk. The OS installation is stored in a separate partition on the harddisk, but you can create your own set of recovery disks/OS installation DVD's. There is an option to create your own set of recovery DVD's included with the PC.
I'm not really sure if i understand what you plan to do? Are you saying that you bought 32 bit Windows, but want to install 64 bit Windows?
Yes - The laptop I purchased comes with WIN 7 32 bit.
I read this online which leads me to believe that I may be able to re-install windows 7 as 64 bit:
"Windows 7 is available in both 32-bit (x-86) and 64-bit(x-64) versions. The Windows 7 package that you buy includes both 32-bit and 64-bit installation discs. Though all computers are compatible with 32-bit Windows, not all are compatible with 64-bit Windows."