http://support.microsoft.com/?kbid=878475
RESOLUTION
To resolve this issue, follow these steps:
1. Click Start, click Run, type X:, where X is the letter of the physical hard disk drive that appears as a removable drive. Click OK.
2. Right-click the Autorun.inf file, and then click Delete.
3. Restart your computer.
1. Click Start, click Run, type X:, where X is the letter of the physical hard disk drive that appears as a removable drive. Click OK.
2. Right-click the SMRTNTKY folder, and then click Delete.
3. Right-click the SetupSNK.exe file, and then click Delete.
4. Restart your computer.