I can't seem to get iFolder Client working with .Net 1.1sp1 on win XP x64.

I've tried 2 diferent clients on win xp x64:

ifolder3-3.4.6129.1-1-setup.exe
ifolder3-3.5.6088.1-1-setup.exe

i know forsure that the first works fine on x86 xp machines i have.

Does any one have any ideas on this? - Is .net 1.1 even supported on xp x64?
I've tried reinstalling .net aswell.

The only thing it says when trying to login is:

"Object reference not set to an instance of an object"

Thanks,
David Olivier