This machine looks to me to be a little weak for running a lot more up to date, powerful video editing software. Not that it isn't a good machine, it just isn't for the job you're trying to do. I looked over the specs on the link you provided and it is lacking in at least three departments.

1. The video card is not very powerful for this work. Search for computers with nVidea or AMD parts. At least 1GB of memory.
2. The processor is only dual core, a pretty out-dated processor now days. A quad core processor would be ideal for this work right now. More processing power is always a plus.
3. I would try to find more RAM.

I know for a lot of work like this, Mac's are a favorite. Lots of designers, artists, and editors used them in college. They're definitely not the cheapest route, but may be a more guaranteed route to getting powerful equipment to crank out quality work. If you're looking for a better machine, just go to your preferred computer supply and when you look for machines, try to focus on the 3 things I mentioned above. Let me know if this helps any or PM me if you have any more questions, I'll try to help best I can.

It looks quite decent to me. However if you do these videos daily, might need an upgrade. Are you dynamic or static, meaning to you move a lot? Desktop computers are usually way more powerful than laptops are.

But if whiteboard videos are your main source of living, it's good to have a good work equipment. I bought Lenovo G510 lately with i7. Quite powerful for the price.