Windows 7 Installation Not Booting Through Flash Drive Or DVD

I'm trying to install a Windows 7 Profession 64 bit version over a Windows 7 Home Edition 32 bit version.

I know this isn't possible without a clean install, but my problem is, the installation won't boot whatsoever.

Two days ago I installed a fresh copy of W7 32 bit over a vista 32 bit with a flash drive on a laptop with no problem, so I know how you make a bootable USB.

This time however, using the Windows 7 USB DVD Download Tool didn't cut it for me as, even though it was prioritzed in BIOS, nothing would happen and W7 32 bit would just boot like normal.

So I tried to manually set up the bootable flash drive, which also didn't work.

After a lot of searching on google, I learned the problem might have something to do with the bootsector not able to be run on a 32 bit OS. [URL] I used the W7 32 bit version I used on the laptop 2 days ago, and put the bootsector of that version on the flash drive.

Again, this didn't work as the computer would just boot windows 7 32 bit like usual (and again, I adjusted the priority in BIOS) Now I got enough of trying the flash drive to work, I tried burning the ISO file on a DVD using Imgburn.

Burning the DVD went smoothly and I quickly had a DVD with the W7 64 bit installation files. This however, didn't solve anything as (again, prioritzing the DVD) W7 would boot up as usual.

OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 32 bit
Processor: Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz, x64 Family 6 Model 30 Stepping 5
Processor Count: 8
RAM: 3063 Mb
Graphics Card: NVIDIA GeForce GTX 560, 1023 Mb
Hard Drives: C: Total - 476837 MB, Free - 132797 MB; E: Total - 234627 MB, Free - 205990 MB; F: Total - 234316 MB, Free - 233246 MB;
Motherboard: ASUSTeK Computer INC., P7P55D PRO
Antivirus: AVG Anti-Virus Free, Updated and Enabled