Aliases: System Defender (other) Spyware Defender (other)
Windows Defender detects and removes this threat.
The threat is a rogue, which means it pretends to be security software. It looks and acts like Windows Defender, but is completely fake.
It uses names such as "Spyware Defender" or "System Defender".
It says it finds malware, viruses, and threats on your PC, and that you need to pay money to fully remove them. The threats do not exist - the rogue is just trying to scare you into paying money for a piece of software that does not work.
The threat might also block access to some websites, change your PC's security settings, and open Internet Explorer windows that load adult content.
It might have been downloaded onto your PC by another malware, or you might have been tricked into downloading it, thinking it was legitimate.
Use the following free Microsoft software to detect and remove this threat:
You should also run a full scan. A full scan might find other hidden malware.
Restore proxy settings
You might need to manually restore your proxy settings.
If you had customized your proxy settings and you know what they should be, you can change them back:
- Open Internet options by clicking the gear symbol in the Internet Explorer toolbar, then clicking Internet options.
- Go to the Connections tab, then click LAN Settings.
- In the Proxy server section click Advanced.
Alternatively, you can reset your Internet Explorer settings to their defaults (this will reset all of your settings):
Get more help
If you’re using Windows XP, see our Windows XP end of support page.