...from the Control Panel/Add-Remove Programs, then if you're using Windows 2000 or XP, follow the instructions in below to install the newest Java 6 Update 6:
Click on the link to Sun's Java below, then scroll down and click on the ''Java Runtime Environment (JRE) 6 Update 6'' download button. Follow the prompts, accept the license agreement, choose your operating system and "multi-language", then download the full ''Windows Offline Installation'' file to your desktop,(about 15 MB), scan it with your antivirus (just to be sure it's clean). Once that's done, if you've already got a Sun Java version on the computer, open the Control Panel, double click on the ''Add/Remove Programs'' section, then uninstall all previous versions of the J2SE Java listed there. Once that's done, then install Java JRE 6u6 from the downloaded installer.
Hope this helps.