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I wanted to uninstall a software in XP Professional,I encountered "Installer UI Mode Error". what's the error for? how it could be fixed?

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What are you trying to install? – Hello71 Aug 20 '10 at 18:37
    
actually i m uninstalling,it s OPNET MODEL LIBRARY V16.0 – user44509 Aug 20 '10 at 23:23

If your Windows operating system does not have a Java Virtual Machine, this error message may appear when attempting to (un)install a product that does use Java.

If you have uninstalled Java between installing this product and now, you might need to reinstall Java for this uninstaller to work.

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Actually this error is due to a bug in the installer. It occurs only if your windows user name contains certain characters like ‘!’ or ‘*’ . A simple way is to create another user account with normal user id without any special characters and install from there. Or you can try renaming the existing user id with a normal name without special characters. If you are renaming the userid, it may require a restart for the change to take place.

Or try uninstalling in an administrator account.

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nope,it's not the reason in my opinion;This is a software with software lock and maybe dependencies; – user44509 Aug 25 '10 at 10:07

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