Hi, What program did you use with this cam? You could use MSN to send or receive the invitation. It seemed the driver doesn't work properly. I suggest going to the manufacture's site, download and install the driver manually. http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?tmplt=ePlatform%20-%20Philips&scy=GB&slg=ENG&sct=NOTEBOOK_WEBCAM_SU&cat=WEBCAMS_AND_HEADSETS_CA&session=20110523022312_207.46.55.29&grp=PC_PRODUCTS_AND_PHONES_GR&ctn=SPC230NC/00&mid=Link_Software&hlt=Link_Software If the issue persist, try to use different ports and reinstall USB controllers. If any error message is received after performing the steps, please let me know exactly. http://blogs.technet.com/b/asiasupp/archive/2010/11/23/error-message-one-of-the-usb-device-attached-to-this-computer-has-malfunctioned-and-windows-does-not-recognise-it.aspx Best Regards, Niki Please remember to click "Mark as Answer" on the post that helps you, and to click "Unmark as Answer" if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.