Hi Rotty and welcome to the Forum.
I assume that when you are attempting to carry out file transfers, that your PR604 is displaying the 'Home' screen (the screen which appears when you first switch on)
If this is the case and the problem still exists, then it is probably due to defective installation of the driver software. You are not alone in experiencing this problem
It is very important to follow the installation procedure 'to the letter' and Win XP usually requires some additional steps, compared to Win 98SE.
There is a full 'tutorial' in the Tech-Tips page of my website (Tech Tip 1).
http://mysite.freeserve.com/willumspages/index.html ------------------
Willum