need step by step help for 32bit to 64 bit win 7

[Morlean]

well when i built the system it was my first build. I was dumb to think 32bit was a more stable OS. now i know i have windows 7 professional that came with the 32 bit and 64bit disk under one key. can i update to 64bit anytime now?
And Ive been using windows 7 32bit now for 6 months.
What is the update process? and do i back up my current windows 32bit on a extrenal hard drive?
sorry need detailed steps still a noob.

Asus P8P67 LE B3 Sandy Bridge Rev 09 motherboard
Intel i3 2nd gen 2100 3.1ghz CPU 1155 socket Freq: 1605.36 MHz
DDR3 corsair xms3 ram 6gigs Dual Channel installed 668.9MHz @ 9-9-9-12
Nvidia geforce 9500GT graphicscard
Coolmaster 550w power supply
Thermaltake v3 black case
Hp 23" monitor 1920x1080 resolution
Razer Deathadder mouse /Lycosa keyboard
Conexant Falcon II NTSC video Capture tuner card
Seagate 2T Expasiondrive
Seagate HDD 500gig main drive
Windows 7 Premium 32bit OS.

 

[her209]

There is no path to upgrade from a 32-bit installation to a 64-bit one. You'll have to reformat and reinstall.

 

[Barfo]

Step 1: Format Hard Drive
Step 2: Install Windows 7 64-bit

 

[Zaap]

^ Always the best way anyway.

 

[Dahak]

Step 1: Backup Data you want to keep
Step 2: Format Hard Drive
Step 3: Install Windows 7 64-bit

There fixed it for you