Version named avanor-0.5.8-dos works perfect on my PC (Windows7 Ultimate x86). If you have 64-bit system it may be source of problem, some elder games/apps (like Mordor - The Depths of Dejenol, for example) dedicated for windows (...seems that avanor-0.5.8-dos is for windows... dunno) doesn't work on x64 systems because 64-bit systems have a little different, hm 'core of system' and doesn't support some (outdating) features which are supported by 32-bit systems.
If you have another version of Avanor, I can send my version via dropbox.
Hm... You can try disable UAC in you Windows.