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					Originally Posted by Mr. Mike
					
				 
				I have winblows XP on my PC. Is it ok to install a different OS but on a separate drive? I want to try it out before byuing another PC or reformating this one. 
			
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 Yes - it's very possible 
Don't try to simply install the new OS on another drive - it will break windows completely.
You can do dual-boot with other windows or even linux OS, or, run a virtual OS software progam that lets you run multiple OS's at the same time. 
I like VMWare the best: 
www.vmware.com
With VMWare, you can have virtual NIC cards so you can browse the web, run a website, etc, without adding extra physical network cards to your box.  VMWare really does it all.
A bunch of dual-boot links:  
http://windows.about.com/cs/dualboot/