本机wampserver环境下安装zencart静态插件Ultimate SEO URLs错误问题

zencart ultimate_seo_urls 安装后 在没改变htaccess_sample前，url地址有改写 但是链接失效 主页后台可以进去。改变htaccess_sample为.htaccess 并改为RewriteBase /zencart/后，就主页后台都进不去了，出现以下情况。到底要怎么安装呢。还是有什么地方要修改的。装了几次都是这样 Internal Server ErrorThe server encountered an internal error or misconfiguration and was unable to complete your request.Please contact the server administrator, admin@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.More information about this error may be available in the server error log.