You can maintain your windows rom. Just download the android rom, extract it n copy the android folder ionto your sd card. On windows use file explorer locate the android folder on card, run clrcad ( you will have no respond , is to enable sound) follow by haret.exe. Phone will flash n takes about a minute n you will have android up.

I always advise you use a fresh format sd card to eliminate issues possibly attributed to rom or windows. Backup all sd card contents first. After successfully have android install, just copy back all your contents

Changing to another android rom is freaking simple, just replace the android folder on card with the new android folder you extract from the new rom zip file

I would suggest you read up first to see whether your present window rom has any issue with the android. Actually most new window rom cooked in the last one month should work , perhaps have issues with those older version

Please advise which Android rom and Windows rom - please give me full version name ? I dont quite understand your comments. With your rom details, maybe I can advise you better

HsLimMC : This is an example of a Windows Rom that comes with built Android boot loader. But the Energy rom you mention I didn't see such details in his summary of features:

http://forum.xda-developers.com/showthread.php?t=774417