My friend brought a ThinkPad SL500 to me. The login password are changed by somethings, that sounds some virus in there. I decided to rebuild the machine. So, I pressed F11 during the startup to enter the recovery center. Then I choose the option to recover the machine with factory setting, I got the message "Not found c:\preload\convert.cmd ". I phoned their helpdesk, I have been told that is because of recovery partition are missing. Thus, the only way to grab a recovery disk from Lenovo.