The error code means The service did not start due to a logon failure.
This basically means that the username/password pair you used during installation was not valid (maybe a typo in the password?)
To correct the problem, go to Control Panel -> Administrative Tools -> Services, open the properties of the "avast! Management Server" service, switch to the "Log on" tab and specify the correct username/password pair here.
Please note that the account should have administrative rights.
Thanks
Vlk