My mother just bought a new laptop, and I want to make sure it lasts as long as possible. The Sims 3 is using 100% of at least one CPU. Is this normal or cause for concern?

Also, will the memory used up by the Sims be freed completely if all Sims 3 data is removed?

Based on my specs (listed below), can I reasonably load and play the sims 2, as well?

And finally, is the Sims 3 using 2,191MB of memory normal?

Could you post your System Specs?

That's pretty normal; Sims 3 is a very CPU-heavy game. So long as you've bought a computer which is solid enough to game on (which your system specs will confirm or deny), it shouldn't be a problem. In any case, CPUs and mainboards tend to be the most robust components in a computer, so CPU stress won't do noticeable damage.

The hard drive space that's used by Sims 3 will be freed up if you uninstall, yes. Memory, however, usually refers to random access memory (RAM) which is something totally different - while you'll probably have several hundred GB of hard drive space, you probably only have 4-8 GB of memory. Memory isn't affected at all by what files or programs you have saved/installed, only by what you actually have open and running at the moment.