Start - Run: Command [Enter]
CD C:\MySQL\Bin [Enter]
mysql.exe --user=root eq [Enter]
Try Grant again.
If you installed MySQL to a different directory than C:\MySQL replace it with your directory.
If you named your database other than "eq" replace that aslo.
I'd recommend reading through this walkthrough -
http://forums.eqemu.net/viewtopic.php?t=6904