With the recent events reinstalling AHP to cure issues isn't possible.
The download servers currently aren't all back up and running.
However this has caused users to get creative.
Backing up your AHP folder then installing the free Marmitec version of AHP
(European version). will get you AHP again.
Taking your back up and overwriting the files the Marmitec version created in the AHP folder will give you back the north American version (modules, holidays and cities)Note:
this backup can be from any windows version from any PC
Also I found (with windows 8.1 at least) a reinstall of AHP is not always needed.
A install of the SDK will usually fix issues with x10nets.
Also deleting or renaming the file C:\ users\all users\x10settings\X10Active.xml
then restarting AHP will solve most AHP start issues.