In my Dell Inspiron laptop which is pre-installed with windows 7 platform along with that 3GB RAM and 320GB hard drive. the machine is compatible with the NVIDIA high definition graphics driver and by default there is an administrator account created which I purchased it. I am not having so much technical idea or the advances option those are applied in today technological world. These is only one account in my machine, no other user or guest account, now the problem is that I am facing an problem with that administrator account. In the last few days back, while I tried to make some changes in the security option of the windows version, it requires to insert the administrative password to begin the process, shows that the administrative account is turned into the guest account. But there is no place to insert the password. Not able to do any windows operation. What should I do to overcome from this problem? Any input regarding this will be appreciated greatly.