flex builder安装出错

遇上这么个问题

!ENTRY org.eclipse.core.runtime 4 0 2009-04-23 20:05:21.109
!MESSAGE 
!STACK 0
org.osgi.framework.BundleException: The bundle could not be resolved. Reason: Missing Constraint: Require-Bundle: org.eclipse.equinox.preferences; bundle-version="[3.2.0,4.0.0)"
	at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:305)
	at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:350)
	at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1118)
	at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:634)
	at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:508)
	at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:282)
	at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:468)
	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:195)
	at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:297)

一直报这个错,新建个用户,重新登录就没有了问题,怀疑环境变量,注册表,"我的文档"(我修个了部分系统目录)
最后根据config.ini发现flex builder会去上My Documents下找Flex Bilder 3文件夹(错误日志文件也是放这里面)
想起我的这个文件夹是原来就版本的Flex Builder残留下来的,所以于是就删了,再次打开Flex Builder 3,它自动生成了新的,一切顺利~