My Rosewill external USB hard drive is connected to my home PC through a USB Hub, running Win Vista. When I hook up the same way to my work laptop, a Lenovo R400 running Win XP, it says it is installed, it shows up in Device Manager (without a drive letter assigned), but doesn't show up in My Computer at all. Have searched and searched all kinds of fixes / ideas - none are working. Have tried removing the Hub and connecting directly to the laptop, but still the same thing. Help!