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The validator see's some invisionpowerboard links as bad html. Im sure this cant be. Hope this helped.
The explanatory text for those errors in the validation results you posted a link to says: The most common cause of this error is unencoded ampersands in URLs as described by the WDG in "Ampersands in URLs". There, "Ampersands in URLs" is a link to http://www.htmlhelp.com/tools/validator/problems.html#amp , which explains what's wrong (you need to replace '&'s with '&'s).