Thanks for your reply Actually I can do PC restore from DVD Windows Vista (factory image) http://support.dell.com/support/topics/global.aspx/support/dsn/en/document?c=us&l=en&s=gen&docid=298A2E89689E13C2E040A68F5B280AA4&cs Moreover I searched on the net to find any way to return back that option but they didn't work, I mean I couldn't complete the process due to some error messeges http://en.community.dell.com/support-forums/disk-drives/f/3534/t/19134368.aspx http://www.svrops.com/svrops/articles/winvistare.htm I think you are right, may be because of that resizing the data corrupted or the recovery ID number and volume have been changed. I don't know When I used Windows AIK and command prompt to type SetAutoFailOver.cmd /target d: /partition 2, it didn't make any sense althuogh I specified the number and letter of the partition Any way I will try to find a way