Hi,
There are a number of log files to be found in c:\progam files (x86)\Maximizer\logs.
You might also find some information in the windows event log under administrative tools in the control panel.
Have a look and let me know if you can find any details of the error there.
Also please can you elaborate on the type of backup that you have. e.g. where did you get it from, what is the file type (.bak?) etc.
Thanks