USB Hard Drive not recognized on Windows 7/XP after using it once on a Mac

[Somans]

My Western Digital USB hard drive was recently connected to a MAC to transfer some files. When I connected it back to my windows PC, it did not recognize the drive.

The drive is about a year old and has about 200 GB of data in it and has always worked on laptops running Windows 7 / Windows XP. Stopped working after I connected it to a Mac.

On the Win 7 laptop, the drive is not recognized.

On the XP laptop, the "found new hardware wizard" popped up and tried locating a driver. The final message was "The hardware was not installed because the wizard cannot find the necessary software"

I also tried replacing the cable.

[Erubiel]

I have a problem detecting my USB. The issue was that Windows detects new hardware but instead to have a removable disk it is showing nothing in My Computer. For resolving this first keep your internet connection live. Then uninstall the unkown device from Device Manager. Restart Windows and let Windows detect drivers via Automatic Update.