netbeans中tomcat無法啟動(急)

我用的是NetBeans 6.1自帶Apache Tomcat 6.0.16;JDK采用jdk-6u7-windows-i586-p.exe
最近在netBeans中run project老是無法啟動tomcat;
以前一直都沒有問題，最近才出的問題，把系統重新裝了，他就好了幾次，又不能啟動，
如果禁止netbean自動更新就可以用，上次我不小心更新了一次，導致tomcat又不能啟動了，現在從新安裝還是不能啟動，
如果不能啟動，創建一個新的系統用戶，再用新用戶登錄，在新用戶中又能啟動，不過也用不了幾次，又無法啟動，
到tomcat安裝目錄下啟動startUp.bat，tomcat是可以啟動的，說明tomcat應該沒有問題，
就是在netbeans中無法調用，但是又不知道為什么在新用戶中又可以用那么几次;
netbeans重新安裝是一點用處都沒有，
當run project報的信息如下，

tomcat 信息
Using CATALINA_BASE:  C:\Documents and Settings\cqq\.netbeans\6.1\apache-tomcat-6.0.16_base
Using CATALINA_HOME:  C:\Program Files\Apache Software Foundation\Apache Tomcat 6.0.16
Using CATALINA_TMPDIR: C:\Documents and Settings\cqq\.netbeans\6.1\apache-tomcat-6.0.16_base\temp
Using JRE_HOME:        C:\Program Files\Java\jdk1.6.0_07
java.lang.NoClassDefFoundError: Files\Apache
Caused by: java.lang.ClassNotFoundException: Files\Apache
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
Exception in thread "main"

project信息
init:
deps-module-jar:
deps-ear-jar:
deps-jar:
library-inclusion-in-archive:
library-inclusion-in-manifest:
compile:
compile-jsps:
Checking data source definitions for missing JDBC drivers...
Starting Tomcat process...
Waiting for Tomcat...
Starting of Tomcat failed.
Deployment error:
Starting of Tomcat failed.
See the server log for details.
        at org.netbeans.modules.j2ee.deployment.devmodules.api.Deployment.deploy(Deployment.java:166)
        at org.netbeans.modules.j2ee.ant.Deploy.execute(Deploy.java:104)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
        at sun.reflect.GeneratedMethodAccessor46.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105)
        at org.apache.tools.ant.Task.perform(Task.java:348)
        at org.apache.tools.ant.Target.execute(Target.java:357)
        at org.apache.tools.ant.Target.performTasks(Target.java:385)
        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1329)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1298)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1181)
        at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:277)
        at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:460)
        at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:151)
Caused by: org.netbeans.modules.j2ee.deployment.impl.ServerException: Starting of Tomcat failed.
        at org.netbeans.modules.j2ee.deployment.impl.ServerInstance._start(ServerInstance.java:1297)
        at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.startTarget(ServerInstance.java:1251)
        at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.startTarget(ServerInstance.java:1062)
        at org.netbeans.modules.j2ee.deployment.impl.ServerInstance.start(ServerInstance.java:939)
        at org.netbeans.modules.j2ee.deployment.impl.TargetServer.startTargets(TargetServer.java:428)
        at org.netbeans.modules.j2ee.deployment.devmodules.api.Deployment.deploy(Deployment.java:143)
        ... 16 more
BUILD FAILED (total time: 1 second)

不知道大家有沒有預見過這個問題，如果能幫忙解決，本人非常感謝！