How can I enable my-huge file on windows server?
You need to stop mysqld, swap in my-huge.ini, and start up mysqld

cd C:\"Program Files\MySQL\MySQL 5.5"
net stop mysql
rename my.ini my.oldini
copy my-huge.ini my.ini
net start mysql


This will only work if you do not have to resize the log files.

If you have to resize ib_logfle0 and ib_logfile1, rename them before startup

cd C:\"Program Files\MySQL\MySQL 5.5"
net stop mysql
rename my.ini my.oldini
copy my-huge.ini my.ini
cd data
rename ib_logfile0 ib_logfile0.bak 
rename ib_logfile1 ib_logfile1.bak 
net start mysql


Give it a Try !!!