Adobe Premiere,one of the best video editing software.But for a new user,learning curve is slightly steep.
http://www.adobe.com/products/tryadobe/main.jsp
Also check out Adobe After Effects.
For easy video editing,two softwares come on top which are very easy to use and have loads of features.They are
Ulead VideoStudio,
http://www.ulead.com/vs/trial.htm
Pinnacle Studio.
http://www.downseek.com/download/21228.asp
There are also otther tools namely Vega Video,Dazzle Moviestar etc.
You can also try out free software Virtual Dub.
http://www.virtualdub.org/index