I'm trying to troubleshoot a PC. it has this problem where it won't allow users to enter any kind of drive such as HDD drives, USB and CD/DVD not even through directory listing that is found on the left pane of 'My Computer'. Access is prohibited through the restart of Windows Explorer. First I thought it would be a virus problem but the problem persists even after a full scan through Kaspersky 2012 (updated). Any suggestions without Re-installing windows will be appreciated. btw, OS is Windows Seven.