I've just installed MyEclipse Enterprise Workbench v3.7.1. Whenever i try to start it, i get the error

!SESSION ----------------------------------------------------------------------
!ENTRY org.eclipse.core.launcher 4 0 Apr 06, 2004 10:39:06.922
!MESSAGE Exception launching the Eclipse Platform:
!STACK
java.lang.IllegalStateException: Bundle reference:file:c:/Program Files/eclipse/plugins/org.eclipse.core.runtime_3.0.0/ [3] is not active
at org.eclipse.core.runtime.adaptor.EclipseStarter.ensureBundlesActive(EclipseStarter.java:127)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:97)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.core.launcher.Main.basicRun(Main.java:279)
at org.eclipse.core.launcher.Main.run(Main.java:742)
at org.eclipse.core.launcher.Main.main(Main.java:581)

!SESSION ----------------------------------------------------------------------
!ENTRY org.eclipse.core.launcher 4 0 Apr 06, 2004 10:39:27.281
!MESSAGE Exception launching the Eclipse Platform:
!STACK
java.lang.IllegalStateException: Bundle reference:file:c:/Program Files/eclipse/plugins/org.eclipse.core.runtime_3.0.0/ [3] is not active
at org.eclipse.core.runtime.adaptor.EclipseStarter.ensureBundlesActive(EclipseStarter.java:127)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:97)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.core.launcher.Main.basicRun(Main.java:279)
at org.eclipse.core.launcher.Main.run(Main.java:742)
at org.eclipse.core.launcher.Main.main(Main.java:581)

!SESSION ----------------------------------------------------------------------

When i remove it i have to uninstall eclipse M7 and re-install eclipse to get the ide to work properly. I guess that the myeclipse install is probably messing up something .

Any help will be greatly appreciated.

A few things:
1) We don't do anything *intrusive* to Eclipse so it seems odd that the IDE won't work after an uninstall of MyEclipse.
2) I would suggest installing Eclispe to a shorter path, preferably something like C:\Eclipse or C:\Java\Eclipse. Problems arise with some plugins when the path has more than 8 chars in it (for example, the Application Server connectors don't like launching apps under C:\Program Files).
3) To "uninstall" MyEclipse, all you need to do is shut down Eclipse, and remove (or move someplace else) the <eclipse install dir>\links\com.genuitec.eclipse.MyEclipse.link file.

To test what is going on, I would suggest you reinstall Eclipse, run it. Make sure everything runs alright. Double check the <eclipse install dir>\workspace\.metadata\.log file for exceptions. If its working fine, close Eclipse, then install MyEclipse (unzip it, and put the com.genuitec.eclipse.MyEclipse.link file in the <eclipse install dir>\links directory... or use the installer). Now run Eclipse again. Did that work? What exception are you getting in the log file? If you got an exception, remove the \links\com.genuitec.eclipse.MyEclipse.link file, and try and start Eclipse again. Did it work? What exceptions are in the log file?

I had same problem. It displayed same exception in logs.
Yes, even after uninstalling myeclipse, eclipse doesn't start.
You can try these steps.
* Uninstall myeclipse. Delete eclipse dir.
* Make fresh eclipse installation. Create a java project.
* Install myeclipse.

ashish, are these the steps you took to fix the problem? pranesh, did you fix your problem?

Yes, it worked in my case. I feel there must be a pre-requisite of
at least one java project created in eclipse before installing myeclipse.
Can myeclipse support team confirm this?
I've tried these steps on eclipse 3.0M7 and myeclpise 3.7.1 on windows 2000 professional.

ashish_8,
We definately do not require any projects to exist for a successful install. I spoke with the dev team and they assured me that most all testing for 3.7.2 release took place with clean installs of Eclipse/MyEclipse with no projects existing.

We are glad the product is working for you, but if you are able to nail down a sequence of events that can help us reproduce this problem, please come back and let us know and we will run it down with you.

I saw the same startup problem with 3.7.2 and eclipse M8. Turns out an install of Oracle changed the JVM being used which hosed the environment. Pushing the JVM bin to the front of the path fixed the problem.

fmfaulkner,
Ahh very interesting, thank you for the info. I'll add it to the FAQ.

i have installed the myeclipse. That was expired. when i am reinstalling myeclipse it is not installing. i have uninstalled the eclipse and myeclipse both. but it is displaying your trail period was expired. Can any one tell me how to reinstall the myeclipse.

It sounds like your trial expired, so I'm not clear on the reinstallation question. Can you better explain your situation?