I was facing problem of not showing hidden files even I choose option to show it in the explorer. This problem started since I burrowed pendrive from my friend. This was actually caused by virus. I don’t know the specific virus but it is of course either visual basic script or and executable file. That actually changed my registry setting of the hidden files in windows registry so even if u change the option to show Hidden files in the folder options ,you cannot see the hidden files in your system.This is done to protect the virus files which are hidden too.So you need to correct the registry setting to see the hidden files. Oh damn it, that virus also modified my registry value to disable Task manager and Registry Editor(The solution to this problem has already been posted).