Windows Server 2003 R2 Enterprise Edition

I am using Windows Server 2003 R2 and want to schedule a task using Task Scheduler but it gives the following error. 0x80090016: Keyset does not exist. Both Task scheduler and Protected storage service are running. Kindly help me how to resolve the issue? Thanks in advance.

try to :

• stop the protected storage service
• Double-click My Computer, and then click Folder Options on the Tools menu. On the View tab, click to select Show hidden files and folders, and then click OK.
• Delete all of the files in the "C:\Documents and Settings\All Users\Application Data\Microsoft\Crypto\RSA\S-1-5-18" folder.
• restart protected storage service
• try to exexute the task