Windows Defender originally was an antispyware program free to the community. Microsoft had the premium (pay for) Windows Onecare Antivirus which they combined with it to make Microsoft Essentials today. Windows OneCare was West Coast Labs Certified and has won the VB100 Award so it wasn't too shabby. However, in recent times they seem to have diverted resources away and Microsoft Security Essentials has paid the price now as even sarcastically called "crapware". Check it out....
PRESS:
Review: Microsoft Security Essentials
http://www.expertreviews.co.uk/software/...
Microsoft Security Essentials bombs AV-TEST, loses certification
http://www.geek.com/articles/geek-pick/m...
Microsoft Security Essentials Fails Tests, Loses Antivirus Certificate
http://www.inquisitr.com/422680/microsof...
Microsoft Security Essentials fails AV-TEST again
Microsoft Security Essentials fails AV-TEST again | bit-tech.net
Microsoft fights back on antivirus certification fail, claims malware tests ...
Microsoft fights back on antivirus certification fail, claims malware tests aren't realistic | ZDNet
As mentioned, MalwareBytes is popular and does a good job BUT there are MANY products that are way, way better especially if you decide to buy a full product offering Real Time Protection. A couple are Symantec Norton, ESET NOD32, Emsisoft Antimalware, Trend Micro, more. I recommend you take a free fully working 30 day trial of ESET NOD32 and my choice as best in world - Emsisoft Antimalware. Both of these offer the free fully working no gimmicks program for 30 days. You like it you buy it, if not simply uninstall easily. Compared to these actually, MalwareBytes is simply not in the same ballpark at all. Both of those and mentioned are combo suites meaning they protect against in real time and scan for all catagory threats in antispyware (adware, spyware, data miners, keyloggers, trojans, etc) and antivirus (worm, virus, trojans, etc). BELOW here are some links you can check out about world independent labs that test products and are not paid from the antimalware (means both antivirus and antispyware threats = antimalware) company industry.....
VB100 Award = Perfect scores ! (Top AntiVirus World Prize)
http://www.virusbtn.com/vb100/index
http://en.wikipedia.org/wiki/Virus_Bulletin
West Coast Labs
http://www.westcoastlabs.org/
AV-Test.org
http://www.av-test.org/
Welcome to
AV-Comparatives.org
http://www.av-comparatives.org/
Malware Research Group
http://malwareresearchgroup.com/
Check out ...... (my pages)
Threats FAQsThreats Frequently Asked Questions
https://sites.google.com/site/pcsecurityhelper/contact