Your suggestions have helped me and I've just managed to fix the problem.
The smartcard reader was connected to the PC while I was trying to install the software and that was the problem.
So I've fixed it and now it works normally.
Thank you!

I'm using Windows XP service pack 2.
Any other suggestions

Hi! I have Respironics REMstar auto with C-flex.I've recently bought a Smartcard reader and installed Encore Pro 1.8 software .I've tried to download the data from the smartcard after creating correctly a new patient account.But then it shows the following error message:"An error has occurred while ...