Microsoft Antispyware is the previous name for this utility which you may already be familiar with.

In essence it is a handy piece of free software which sits in your system tray (down by the clock) and monitors what is trying to install itself onto your computer. When it spots something it is unsure about it prompts you to see if you want to allow it to continue installing, or if the offending program should be blocked. This has saved me a few times from rogue websites trying to change my internet settings or homepage, and the occasional piece of spyware which is sometimes hidden in some innocent-looking freeware, as i’ve found out in the past.

Windows Defender, new name, new features?

Following the automatic upgrade of my working version of Microsoft Antispyware to the new Windows Defender, the new program has been unable to download any definitions - definitions it needs to work properly, so i am now left without any spyware defences!

Hopefully Microsoft will release an improved version soon which doesn’t suffer from these glitches, but for now my recommendation is decline the automatic update when prompted, and don’t rush into trying Windows Defender.