The best software that has not let me down would be The Microsoft Security Essentials (MSE) compare to most other products.
From my experience MSE gives good protection rates, would say about 95% accurate at detecting threats. It does use quite a bit of system resources which can take long to scan and makes your computer slow while scanning however once installed it will always keep you updated and protected. To download click MSE Download
What includes in the package:
- Provides you with real time protection
- Virus, spyware and malware protection
- Windows firewall, It also protects you from web based threats.
- Protection against network-based exploits
AVG Internet Security 2011
To Download Click AVG Internet 2011 1st key: AALA9-IS4EL-DUIGR-AIJIL-DA4QR-3WDST 2nd key: 8MEH-RXYFD-JUV72-8922R-FTDO8-QEMBR-ACED
What includes in the package:
- Maximum Protection against Trojans
- Key Loggers, Anti-Root kit protection
- Identity Hackers, Virus & Spyware Protection
- Email Viruses, Firewall Link Scanner & Real Time Protection
Antivir Free Edition
![](http://download.cnet.com/i/bto/20090317/avira_9_main_610x431.png)
What includes in the package:
- Choose and Modify your detection rate from Highest to Lowest.
- Real-Time Protection against Malware, Trojans, Worms, Virus, Dialers, Rootkit, Spyware and Adware.
- On-Demand scan and Quick removal of detected Malware
- Early Load Protection
- Quarantine and online submission of samples
- Scheduled Tasks to update and scanning
- Anti-Phishing
Avast Free Edition 5.1.889
![](http://img.brothersoft.com/screenshots/softimage/a/avast_home_edition-330947-1287741645.jpeg)