It is probably a good idea to download from this link http://www.decodephp.com 
as the wordpress plugins download sections seems to miss the tempfiles directory or the file in it for some reason , 
this directory is very important for the plugin to work.
This plugin will help you quickly switch between wordpress admins by letting you select from a list of blogs you have entered in the 
WP Admin Switcher administration section. Assuming you are on the posts management page , and you select a different blog from the drop down you will be immediately switched to that blogs posts management page. The plugin attempts to keep all functionality intact. When you are on the other blogs page , you continue to see the drop down , you can select “Parent Site” from the list to jump back to the parent blog.
The plugin will also work with free blogs hosted at wordpress.com.

WP Admin Switcher

It is probably a good idea to download from this link http://www.decodephp.com

bsndev

#1 SECURITY PLUGIN for WordPress! We’re the only plugin that gets updated regularly to protect against the latest threats! Why trust your work to a plugin which hasn’t been updated in months or years?
Every day, hackers take over WordPress installations and delete the user’s data and blog posts and use their servers for illegal activities. Don’t be a victim – we’ll help you prevent getting your thousands of hours of hard work on your blog taken over by a hacker and deleted.
Our plugin identifies security problems with your WordPress Installation. It scans your blog for hundreds of known threats, then gives you a security “grade” based on how well you have protected yourself. You can fix the problems yourself, or you can use our <a href="http://www.ultimateblogsecurity.com/" title="help" rel="nofollow ugc">help</a> to do it for you automatically.
Our plugin and service is designed to be used by anyone from a complete newbie to an advanced PHP engineer.
Customer, Blogger and Media Reviews
<ul>
<li>“The best part about Ultimate Security Checker is that it’s so easy to use.” – digwp.com </li>
<li>“I was not aware that the install.php files remained and posed a security risk. Thanks for that!” – CLN </li>
<li>“I found an issue I was unaware of… Now I can make sure to fix it on all my blogs.” – Derek </li>
<li>“5/5 Stars!” – Our customers </li>
</ul>
FEATURES
<ul>
<li>One click installation and activation</li>
<li>Automatic security scan of your blog</li>
<li>Calculation of a letter grade based on how protected your blog is</li>
</ul>

Ultimate Security Checker

Plugin helps you identify security problems with your wordpress installation. It scans your blog and give a security grade based on passed tests.

WP Admin Switcher vs Ultimate Security Checker