just use this software buddy, u will forget every other software. compression rate is better than techsmith's camtasia. i agree that camtasia is the best. but its heavy in size both the programme & the recorded file size.
its called BB FLASHBACK. the link is here.
http://www.bbsoftware.co.uk/bbflashback.aspx
what more, it can record audio also if u have sound card. its simply the best software. fastest and small in size, best quality. use it to believe it.