missing plugins?

I uploaded all the following plugins but when I attempted to activate them the following areas occurred. How do I address this problem?

Post-Plugin Library

Warning: require(/home/nature1/public_html/wp-content/plugins/post-plugin-library/common_functions.php) [function.require]: failed to open stream: No such file or directory in /home/nature1/public_html/wp-content/plugins/post-plugin-library.php on line 40

Similar Post

Warning: require_once(/home/nature1/public_html/wp-content/plugins/languages/en/stemmer.php) [function.require-once]: failed to open stream: No such file or directory in /home/nature1/public_html/wp-content/plugins/similar-posts.php on line 569

Max Banner Ads

Warning: require_once(/home/nature1/public_html/wp-content/plugins/max-banner-ads-lib/include/max-banner-ads.cls.php) [function.require-once]: failed to open stream: No such file or directory in /home/nature1/public_html/wp-content/plugins/max-banner-ads.php on line 35

maxblogpress-optin-form-adder

Warning: require_once(/home/nature1/public_html/wp-content/plugins/optin-form-adder-lib/include/optin-form-adder.cls.php) [function.require-once]: failed to open stream: No such file or directory in /home/nature1/public_html/wp-content/plugins/maxblogpress-optin-form-adder.php on line 35

2) After I click MBP Ping Optimizer the following appears

Warning: require_once(include/options-pg.php) [function.require-once]: failed to open stream: No such file or directory in /home/nature1/public_html/wp-content/plugins/maxblogpress-ping-optimizer.php on line 299

However, MaxBlogPress Ping Optimizer plug-in is activated, unlike the other above.