Probleme Netbeans !

Bonjour !

Depuis un mois Netbeans ne veut plus fonctionner...
C'est à dire que les outils ne fonctionne pas, quand je clique pour ouvrir une fenêtre outil mais elle ne s'ouvre pas...
Quand je glisse une page html dans NETBEANS il affiche TOUJOURS chargement mais n'affiche même pas le code, toujours apres une heure d'attente.

Comment faire ?

P.S : J'ai déjà désinstaller et ré installer plusieurs fois netbeans sur mon PC, installer différente version aussi. Du jour au lendemain

Voici un message d'erreur qu'il m'affiche :

message d'erreur :

java.lang.NullPointerException
    at com.sun.java.swing.plaf.windows.XPStyle.getTypeEnumName(XPStyle.java:155)
    at com.sun.java.swing.plaf.windows.XPStyle.getBorder(XPStyle.java:277)
    at com.sun.java.swing.plaf.windows.WindowsLookAndFeel$XPBorderValue.getXPValue(WindowsLookAndFeel.java:2402)
    at com.sun.java.swing.plaf.windows.WindowsLookAndFeel$XPValue.createValue(WindowsLookAndFeel.java:2357)
    at javax.swing.UIDefaults.getFromHashtable(UIDefaults.java:232)
    at javax.swing.UIDefaults.get(UIDefaults.java:162)
    at javax.swing.MultiUIDefaults.get(MultiUIDefaults.java:64)
    at javax.swing.UIDefaults.getBorder(UIDefaults.java:480)
    at javax.swing.UIManager.getBorder(UIManager.java:746)
    at sun.swing.FilePane.installDefaults(FilePane.java:428)
    at sun.swing.FilePane.<init>(FilePane.java:289)
    at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.installComponents(WindowsFileChooserUI.java:205)
    at javax.swing.plaf.basic.BasicFileChooserUI.installUI(BasicFileChooserUI.java:173)
    at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.installUI(WindowsFileChooserUI.java:150)
    at javax.swing.JComponent.setUI(JComponent.java:664)
    at javax.swing.JFileChooser.updateUI(JFileChooser.java:1803)
    at javax.swing.JFileChooser.setup(JFileChooser.java:370)
    at javax.swing.JFileChooser.<init>(JFileChooser.java:343)
    at javax.swing.JFileChooser.<init>(JFileChooser.java:296)
    at org.netbeans.modules.project.ui.ProjectChooserAccessory$ProjectFileChooser.<init>(ProjectChooserAccessory.java:522)
    at org.netbeans.modules.project.ui.ProjectChooserAccessory$ProjectFileChooser.<init>(ProjectChooserAccessory.java:522)
    at org.netbeans.modules.project.ui.ProjectChooserAccessory.createProjectChooser(ProjectChooserAccessory.java:457)
    at org.netbeans.modules.project.ui.actions.OpenProject.actionPerformed(OpenProject.java:79)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:290)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
    at java.awt.Component.processMouseEvent(Component.java:6504)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6269)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4860)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4686)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
    at java.awt.Container.dispatchEventImpl(Container.java:2273)
    at java.awt.Window.dispatchEventImpl(Window.java:2713)
    at java.awt.Component.dispatchEvent(Component.java:4686)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
    at java.awt.EventQueue.access$000(EventQueue.java:101)
    at java.awt.EventQueue$3.run(EventQueue.java:666)
    at java.awt.EventQueue$3.run(EventQueue.java:664)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:680)
    at java.awt.EventQueue$4.run(EventQueue.java:678)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
    at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:162)
[catch] at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)