If you are wanting to keep all your files and folders, program settings and basically have your new install looking the same as your previous there is a very simple way of doing this.
keep in mind it will not transfer over programs only their settings.
You will need an External hard drive larger then your current internal, or a network location that has enough free space, (easiest to just use a external HDD)
open your start menu and type in "easy" select windows easy transfer,
If you are on a laptop, plug in the power as this will take quite a long time.
Click next,
Select > An external hard disk or USB flash drive
Select > This is my old computer
Wait for the program to scan your computer (this may take from a few minutes upto a few hours depending on the size of your internal hard drive) i suggest going away from the PC for around 30 minutes and just check every so often.
Select the user accounts you wish to transfer,
Click next,
type a password if you wish
click save/press enter
browse to your external hard drive
click save
Wait for all your Program settings files and folders to be copied to your external hard drive.
install your new 64 bit operating system (depending on the laptop you can use the Recovery tools to reinstall a fresh 64 bit copy of windows)
make sure you keep the usernames the same for the new install
Open the file on the new computer and click this is my new computer
select the user accounts you wish to copy over,
click next/ok all your files will be copied over,
after copying restart the computer
Enjoy your new 64bit windows 7 and all your files and folders present,
this tool also allows you to see a list of programs that were installed on your old install.
Good luck!
Luke.