Vista - Vista + IntelliType Pro 4000

Anyone know if there's any compatibility issues between Vista Home Premium 64bit & the IntelliType Pro 4000?

I recently purchased this KB but when I hooked it up & installed the software it started going haywire.

The behavior was quite odd; it was as if the Home key was being press 100s of times a second. It was bad enough that I couldn't double click on any icons as the instant the first click happened, the focus changed from the icon I clicked on to top-left most icon on my desktop. Also, If I went to type in a field, it would reverse it.
For instance, I opened run to type notepad, it input:
dapeton
The cursor moved to the home position after every keystroke.

After this, I tried unplugged the KB but the behavior persisted. It'd go away for a short time after rebooting but always come back. At that point, I uninstalled the software & I rebooted, then yanked the USB cord & put it back in & it hasn't reoccured again since.

Anyone have any ideas? I'd like to have the KB software installed to customize the extra keys but not at the expensive of using the KB itself...

Thanks!