Maxima does not work/



Dear colleagues.
?
Maxima 5.13?for Windows ?was installed on two computers in 2008.
One computer is a server. It provides the Maxima services via WWW.
Another computer is a notebook.
Everything went well since that time until ?  some day between ?  September 6 2013 and September 10 2013 when both packages Maxima stoped to work on the computers. 
?
No version of Maxima for Windows does not ?  work on these computers now.
?
I guess that the installed Maximas wrote something in the registries of the computers.
?
I ask you to help me in solving the problem
?
Yours 
Andrey Kirillov
professor of ?  Moscow Power Engineering Institute (Technical University) ???