How do I remove one of the operating systems from my computer?

When I turn on my computer, a screen pops up and and says that i need to select one of the operating systems. I have TWO windows xp home professionals on my computer, and i am running very very low on memory. I tried to reboot my computer, but I THINK they BOTH will be rebooted if I do so. Is there any other way to remove one of the operating systems? If so, please let me know step by step



Last edited by DragonMaster Jay on 25th July 2010, 7:02 pm; edited 2 times in total (Reason for editing : Removed signature.)

Edit the Boot.ini file: http://support.microsoft.com/kb/289022