You must use https://192.168.0.2:81
and not https://192.168.0.2
, the :81 is absolutely nescessary to connect to the controlpanel! Please try to access the page with firefox in case you used IE before, firefox gives better SSL error messages in case your SSL-Cert is corrupted.
Please post the output of:
A reinstallation is most liekly not nescessary.