Is AdBlock Plus enabled? Right-click on the ABP icon in the Toolbar or the Status Bar and be sure "Enable ABP" is checked.
Have you added a Filter Subscription? Right-click on ABP icon in the Toolbar or the Status Bar, click Preferences, click Filters, does it show a filter? If not click "Add Filter" and choose one. Limit how many you choose; usually one is sufficient.
Look at the links at the top of the page below. Visit their forum with your questions about ABP.
The information submitted with your question indicates that you have out of date plugins with known security and stability issues that should be updated. To see the plugins submitted with your question, click "More system details..." to the right of your original question post.
Adobe PDF Plug-In For Firefox and Netscape "9.3.2"
New Adobe Reader X (version 10) with Protected Mode just released 2010-11-19
Choose the latest #.x version (example 9.x, for version 9)
Choose the highest number version listed
NOTE: 10.x is the new Adobe Reader X (Windows and Mac only as of this posting)
Choose your language
Download the file
Windows: choose the .exe file; Mac: choose the .dmg file
Using either of the links below will force you to install the "getPlus" Adobe Download Manager. Also be sure to uncheck the McAfee Scanner if you do not want the link forcibly installed on your desktop