plesk 10.x not working on a server

[AbhishedkC]

I have server which has plesk 10.x installed. (originally 9.x was installed upgraded to 10). Suddenly the plesk panel is inaccessible. sever management people advise me that either licence expired or filed corrupted. They also tell me parallels also do not support ver 10. kindly advise what can i do? I am not much of a terchnical person.