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You may try this; Turn OFF the laptop, remove the power sources (ac adapter and battery). Without power sources, hold power button 10 secs. Put back the power sources, and power ON the NB.
If same problem persist, boot from safe mode. Here's how;
computer on or Restart the computer
tapping the F8 key. The Windows Advanced Boot Options Menu appears. If
begin tapping the F8 key too soon, some computers display a "keyboard
error" message. To resolve this, restart the computer and try again.
that the Safe mode option is selected, not Repair Your Computer
Enter. The computer then begins to start in Safe mode.
are finished with troubleshooting, close all programs and restart
the computer as you normally would
If same problem persist, try reloading the Vista again.
Reboot the computer, after it beeps start pushing F8. You should get a menu. Select Safe Mode and push enter.
Once Windows comes up click start and type in CMD (for Vista/7). Right-click cmd.exe and select "Run As Administrator". (For XP: click start then Run. Put in CMD and click OK). Put in msiexec /unregister Then bring up the Run box again and put in msiexec /register Close the CMD box and reboot the PC, letting it boot as normal. Try the Java install process again. If it still doesn't work try the SFC command listed in the above KB article (which I can help with).
First question is do you have the vista disk ? If so , here are the steps to repair. Insert disk ....instead of selecting install vista , after the language selection box , select repair a menu will then be shown with the options you can choose from , choose start-up repair , this will repair missing files or disk errors. once selected no more input is needed from you. Hope this helps !