I get the same error. Running Windows 2000. Error seems to occur when I am not using the computer for a while and Xolox is running. If I am on the computer with Xolox running the error does not occur. I only use the blank screen screen saver, so its not a conflict with the screen saver. Possibly its that option in the program to use switch to max download when the computer is not in use for a period of time. Definitely a programming code problem. You have to restart the program to get the downloading to resume.