you should visit the GGD before going to a (tropical) country outside europe for advise

(no i dont work at a GGD (not anymore))...
to reply on your earlier post: the firewall needs to have several ports opened before you can remote install the client. see the manual for the ports that are needed....
so you have the client installed "succesfully" now?
try this:
go to the services and put the avast services on manual (meaning you dont have protection at the moment you boot)
reboot the server
see if it boots normally, if it does then go to the services again and see if you can start the services manually
what kind of account is the account you use for installing?? administrator?
has there been anything in the logs from the AMS server which had error notifications?
you sure that the mirror on the AMS server is good, not missing any files i mean....
download the netclient from the website and install that one to see if it works:
http://files.avast.com/iavs4pro/setup_av_net_full.exe (contains all languages, also dutch)
http://files.avast.com/iavs4pro/setup_av_net.exe (english only)