Socerer,
Your computer is pretty fast, so I say lets focus on something else. Lex might be right about your RAM too. I can't believe HP sells XP machines with 448 MB RAM. Whatever happen to the other 64 MB? =P
Its been "stolen" by the IGP, the specs indicate its probably a budget PC, so a quick way to cut cost, is instead of the Intergrated Graphics Processor (IGP for short) having some of its own dedicated ram, it takes some off the main memory, whereas GPUs (Graphics Processing unit) usually has its own dedicated ram.
HTHs