Top Apps Must Have

Top Windows apps of 2012    
  
Security Software.   
 
Avast Free Antivirus    
AVG AntiVirus Free 2013
Malwarebytes' Anti-Malware
Hotspot Shield

Utilities   
     
CCleaner    
Advanced SystemCare
ARO 2012
Glary Utilities  
 
Internet Software 
 
YTD Video Downloader
Free YouTube Downloader
Internet Download Manager
4Sync   

Video Software 

VLC Media Player 
GOM Media Player 
UMPlayer 
FormatFactory 
 

 Source 
Google,Cnet