If your Windows computer has java web start popup, these steps could help get your computer going again, in order to solve your computer problems, you can have a try!
1.First of all click the Start button to view the Start Menu. Then choose the Control Panel option.
2.After click Control Panel, enter into System and Security, then click into Windows Update.
3. Now you are at the Windows Update section of our Window 7 Control panel. You can manually look up for any new updates by clicking the Check for updates button
First, open up Notepad by pressing Windows Key + R to open Run and type notepad to get a new Notepad window. Paste the following text:
Windows Registry Editor Version 5.00
Save the file with CTRL + S --- name it whatever you like, but be sure that it ends in.reg to make it a Registry file.
Double-click the new file and confirm adding it to the Registry.
Now, you can restart the computer to re-enable automatic updates, or open the Start Menu and choose Control Panel > Windows Update to check for updates on the web manually. You should find new updates waiting for you, despite XP not receiving any updates since 2014.