32-bit vs 64-bit PowerShell ISE

I'm trying to get better at using PowerShell, and I've seen that you can get a nice GUI interface using PowerShell ISE.  On my Windows 7 machine, when I click the Start menu and then start typing "PowerShell ISE" (without the double quotes) I see there's a 32-bit version and a 64-bit version.  Cool, and all that, but which "should" I use?

Basically, use the 64 bit version unless you are interacting with software or cmdlets that only work with the 32 bit version of PowerShell.

Doctor Who :

I had the same issue but succeed with the below commands  a while back.

From Start-->Run

c:\windows\syswow64\Windowspowershell\v1.0\powershell_ise.exe

if you have errors in the scripts try to set privileges

Set-ExecutionPolicy Unrestricted -Scope CurrentUser