Transporting eclipse to another computer?

I got a new computer so I want to transport my eclipse and the workspace to the new computer. I put them in the exactly same directories as in the old one, but it doesn't work any more.
I could still work on the projects that I checked out from the SVN, but I can't run any project build by myself. everytime I run, it replies "could not find the main class, project will exist"
Is there any other path I should change?
in my old computer, the workspace is E:\Java\, the eclipse directory is E:\eclipse, and I put them in the exactly same place. Is there any other thing I should do?
Thanks,
ps: the whole error message is :
java.lang.UnsupportedClassVersionError: Bad version number in .class file
     at java.lang.ClassLoader.defineClass1(Native Method)
     at java.lang.ClassLoader.defineClass(Unknown Source)
     at java.security.SecureClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.access$100(Unknown Source)
     at java.net.URLClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Exception in thread "main"
Edited by: usfish on Apr 17, 2008 1:20 AM

abenstex wrote:
As far as i know java.lang.UnsupportedClassVersionError: Bad version number in .class file means that you try to run a Java program that was compiled with a different JDK. Do you have the same JDKs on both PCs?Correct.
@Op. Install a newer JDK on the machine (and configure Eclipse to use it)

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