myeclipse安装出错 an error has occurred. see the log file

我用的是myeclipse5.1我以前可以装，可是现在却装不了了！提示我an error has occurred. see the log file c:\Documents and Settings\杨俊\workspace\.metadata\.log. 在日志文件是这样写的：
!SESSION 2007-10-06 19:55:10.031 -----------------------------------------------
eclipse.buildId=M20070212-1330
java.version=1.5.0_11
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=zh_CN
Command-line arguments: -os win32 -ws win32 -arch x86

!ENTRY org.eclipse.core.runtime 2007-10-06 19:55:15.125
!MESSAGE Product com.genuitec.myeclipse.product.ide could not be found.

!ENTRY org.eclipse.osgi 4 0 2007-10-06 19:55:15.156
!MESSAGE Application error
!STACK 1
java.lang.RuntimeException: No application id has been found.
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:56)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
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.invokeFramework(Main.java:336)
at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
at org.eclipse.core.launcher.Main.run(Main.java:977)
at org.eclipse.core.launcher.Main.main(Main.java:952)
!SESSION 2007-10-06 20:25:26.578 -----------------------------------------------
eclipse.buildId=M20070212-1330
java.version=1.5.0_11
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=zh_CN
Command-line arguments: -os win32 -ws win32 -arch x86

!ENTRY org.eclipse.core.runtime 2007-10-06 20:25:31.859
!MESSAGE Product com.genuitec.myeclipse.product.ide could not be found.

!ENTRY org.eclipse.osgi 4 0 2007-10-06 20:25:31.890
!MESSAGE Application error
!STACK 1
java.lang.RuntimeException: No application id has been found.
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:56)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
由于问题字数有限，没有把日志复制完，只有上部分！
这是为什么呢？我重新装了好多便还是这个样子，而且我还下了myeclipse5.1也是同样的问题！请高手提示下！！ 对了 我用的JDK是1.5的！谢谢！！
能不能再说的具体点！！ 我以前都可以装的，可是现在为什么就不行了？还有 把myeclipse里那个文件考到eclipse的那里？

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