I am having a Western digital My Passport Essential 500GB external USB hard drive.I bought a new laptop, and I tried to use the My Passport drive to transfer files from the old laptop. When I pluged the MY Passport into my old laptop, I could access it through windows explorer -- it looks like a regular drive. However, when I pluged it into my new laptop and double clicked to open it, I received a popup saying: "E:\ is not accessible. Access is denied." My old laptop is having windows XP and newone is having windows 7 64 bit.