Why did eclipse add a CLASSPATH variable to my system?

After recently installing eclipse I discovered that while I can still compile normally I was getting NoClassDefFoundError running java from my command prompt.
After some puzzlement and wondering if I had gone crazy I noticed the new environment variable CLASSPATH.
Two questions.
1) Why?
2) Can I get rid of it safely or will that give eclipse upset?

I recently installed two things. Eclipse andiTunes
(but only because I
wanted QuickTime). So I guess it was iTunes. Howvery bizarre.
Just out of curiosity: what was the value of that
CLASSPATH variable?
kind regards,
JosUmm I already deleted it but it was pointing to
something javaish. I think something in the lib/extActually I still had a command window open and env said this
CLASSPATH=C:\Program Files\Java\j2re1.4.2_03\lib\ext\QTJava.zip

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Date: Mon, 15 Oct 2012 00:41:57 -0600
From: [email protected]
To: [email protected]
Subject: When loading Elements 10 why did it remove my Nic Software add-ons in Lightroom 3?
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