1. Check this folder: C:\Documents and Settings\All Users\Application Data\Microsoft\Crypto\rsa\S-1-5-18, there could be a filename starting with “d42cc0c3858a58db2db37658219e6400_xxxxxxxxxxxxxxxx”. (xxxx can be any characters), backup this file and then delete it. (It will be re-created automatically.)
2. Check “Services.msc” and make sure “Protected Storage” and “Task Scheduler” services are running.