I run Windows XPSP2, my ISP is BT Broadband, security suite is BT NetProtect Plus which is essentially a McAfee product. I am having trouble with a printer connection - when I turn it on I receive a message "USB Device not recognised". I have done usual things turned off, unplugged, replugged with identical lead that is known to be OK, uninstalled software and tried to reinstall from CD (cannot complete as message recived again as oon as I turn on printer). Final solution is to click on this message as it advises to obtain USB troubleshooting advice from Microsoft Help and Support Centre. This is when I get message in my original question which prevents me going further. I have accessed Windows/Contol Panel/Internet/Security and set level to medium but this makes no difference. Contacting my ISP, I was told this was an incompatibility issue with Mozilla. If so I have no way of finding out what my connection problem is.