is this a recent problem or inherited hardware? 'coz if you don't know the history of the lappy, then it is possible that a previous user has disabled the control panel, using software such as the security features of system mechanic (
www.iolo.com ). even if it has not been specifically disabled, then it may be worth disabling it yourself then re-enabling it to jump start it back into life.(reboots in between changes) or a registry repair tool may help.