Is windows defender an anti virus?

no,it ani spy

Is windows defender an anti virus?aurora

Windows Defender is a free Microsoft anti-spyware program. It is included in Windows Vista but can be downloaded for XP. It can be fractious, and isn't terribly efficient either. Go with Samuel Adams's suggestions.

Is windows defender an anti virus?download

No - it's anti-spyware (but it's not really that good). If you want a free anti-virus I recommend in order of popularity, but please choose the right one for you (install only one):

1. AVG Free

a. A simple interface (easier to use than Avast! and Avira)

b. Can detect about 82.82% of viruses

Cons: low virus detection

2. Avast!

a. Real-time protection

b. It has an option to delete a virus once found

c. Can detect about 87.46% of viruses.

Cons: Too many icons and confusing user interface

3. Avira AntiVir

a. It can detect malware better than Avast and AVG

b. It's cute umbrella icon

c. Can detect about 94.26% of viruses

Cons: A very sluggish update

If you want anti-spyware that actually finds stuff, I would recommend getting Ad-aware and Spybot Search and Destroy (they are also free).
Windows Defwender is anti - SPYWARE
It'a an antispywares but definitely not good.