Names of some applications correspond to their features in quite unexpected way. In this case, the application that, judging from its name, aims at defending your PC, actually defends itself. The following self-defending measures are applied by the badware: interfering with software capable to perform AV Defender 2011 removal; hiding its files; creating backup copies; denying access to certain websites, first of all to those providing security software and tips.
In order to uninstall the badware you may need to restart in Safe Mode with Networking in case of the recommended antivirus downloading or installation error.
Click this secure link to get rid of AV Defender 2011 known as Microsoft Security Essentials Alert adware. The latter is a generic name indicating relation of the badware to the alert advertising 5 fake system security solutions.  

Having the malware of AV Defender 2011 at the computer system poses a great challenge to your computer system safety and stability. Even if the above sections of this review stress more on AV Defender 2011 annoying ads and state that AV Defender 2011 is unlikely to slow the computer down or do other damage, the programs it may come bundled with are very likely to do that. In this connection, be aware that adware like AV Defender 2011 is often bundled with so called subservient malware like virus or worm containing a payload.
That is to say how important is at least to start removing AV Defender 2011 automatically, for that would launch free malware scan and thus aware you about all the infections actually threatening your computer system.
Naturally, automated AV Defender 2011 removal is performed by Spyware Doctor with antivirus that you need to download and install. This software will also provide the protection from further malware intrusion. In order to start free scan as a first step to the final goal of AV Defender 2011 and related / unrelated infections removal, follow the link below.

Please, follow the instructions below precisely in order to get rid of AV Defender 2011 manually. Please, pay attention to the following precautions: failure to comply with AV Defender 2011 removal precaution may result in failure to remove AV Defender 2011 and damaging of the computer system and important personal data.
You need to print AV Defender 2011 removal manual out, because text editors and any other software shall not be applied during AV Defender 2011 removal process. The best way to ensure the compliance with this rule is to reboot and disconnect to the Internet prior to the beginning of AV Defender 2011 removal.