Google Explaindio, easy sketch pro or easy video sales letter if you want video creation software. Explaindio and Easy Sketch do the whiteboard animation style EVSL produces slides like a powerpoint presentation. I think they are all about the $50 mark.
Vidsy is another alternative. there you work on a template system to create a powerful sales video.
There are plenty other solutions. Easy video suite does it all for you so you don't have to worry about creating the page but it's almost $400.
If you want screencapture videos Camtasia is under $300 and then there is Jing which will let you record a 5 minute video free.
Of course you can use Windows movie maker which you can download from microsoft free. It's a lot better than the current live movie maker that comes with W7 and W8.
Create your slides with powerpoint or the open office version, save each slide as a jpeg, Use audacity, which again is free, to do the voiceover and marry it all together in WMM. It's all fairly easy to do and you can get some cracking results if you use the right templates and images.
It's a lot easier to do a video than a sales page because you can convey emotion with your voice. All in it shoudn't take you more than 10 minutes per finished minute of video to do and you get quicker with practise.
