Is there a free encyclopedia on the internet I can download and keep?

I have a (slow) Dell Windows XP. I need a reliable encyclopedia like World Book I can keep on my computer.

NO
BUT YOU MAY BUY THIS ONE….

http://www.britannica.com/

THEY DO HAVE A FREE TRIAL
I WOULD RECOMMEND YOU TO BUY IT THOUGH

ONLINE ,TRY THIS

http://en.wikipedia.org/wiki/Main_Page

ADD TO YOUR FAVOURITES IN IE7
IT WILL LOAD FASTER
IT IS FREE
BUT YOU MAY ONLY REFER

YOU CANNOT DOWNLOAD THIS
ENCYCLOPAEDIA

BUT YOU CAN SEARCH FOR ANYTHING
AND REFER TO ANY ARTICLE

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Opening Encyclopedia 2011 Basics