The problem seems to be related to the 64 bit drivers.
And that's a tricky question.
If waiting is not a problem I'd reccommend waiting for the next
version (rumor is a new Nspire OS is due anytime soon, maybe a new
version of the computer link will also be available), that may already
include 64 bit support (TI people, care to comment on this issue?).
Other options are:
1. Install Microsoft's virtual PC with a XP installation; it's a
virtual machine, quite handy to develop websites as it allows you to
have multiple browsers and multiple OSes in one single computer, but
can also be used to run legacy apps.
2. Wait for Windows7 that will have a complete OS virtualization to
run XP compatible software.
Behind door number 3, unfortunately, you only have the option of
turning in your 64 bit laptop and getting a 32 bit one (not my
favourite solution...).
Hope this helps,
Nelson