"My Computer" tells me that I've got "448 MB of RAM". I also installed RAMIDLE on my notebook, this is showing me also 448MB as the capacity of my RAM. But when I bought the comp I thought it has 512MB. Is this normal, that it shows only 448?
Your video card may be using some of the total ram as a shared resource. The difference is 64 mb, so see if the specs tell you that you have a 64 mb video card on it.