I bought my Macbook Pro last year so it's fairly new with the latest software installed in it, so today I used my computer all day long and I noticed it was acting very slow. I wasn't downloading music etc. All I was using it was for just drawing pictures (on Manga Studio 5 if you must know) so a virus could be out of the question. So after it started acting slow I checked my memory and it was 988 MB on free memory, so immediately I closed ALL programs and turned off my computer. Waited for a few minutes and turned it back on and checked the memory and it was at 905 MB!!? Usually my Mac ranges from 1.40-1.60 GB of free memory. How do I solve this? What is happening?