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What is XUL runner AND why does it state couldn't run XRE functions

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When I tried to update either 6.2 or now 7.0 on my xp laptop I get the XUL runner popup and it states the above about XRE function. Since I don't know what either means. How can I do a sucessful update.

When I tried to update either 6.2 or now 7.0 on my xp laptop I get the XUL runner popup and it states the above about XRE function. Since I don't know what either means. How can I do a sucessful update.

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