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Another problem in such old systems can be: you have a too old Internet Explorer that is used to display our welcome page. When you experience a problem that Spoon starts but crashed without a warning than this can be the issue. Update your Internet Explorer to at least Version 6, see: http://jira.pentaho.org/browse/PDI-1042
Last but not least: When you get an error like "org.eclipse.swt.SWTException: Unable to load graphics library [GDI+ is required] (java.lang.NoClassDefFoundError)" download the GDI+ redistributeable from here http://www.microsoft.com/msdownload/platformsdk/sdkupdate/psdkredist.htm