Holy shit! These computers boot up swapping, and that's before the 17 unnecessary, fear-inducing, and competing anti-virus programs start up in the system tray, bogging it all down worse.
They have fast processors, fast wireless, but no goddamn memory. I have to make up lame analogies to everybody I complain to. "It's like having a Ferrari but buying it without oil, and never putting any in." Although I tend to hate analogies involving consumables for non-consumables, lest it give people the mistaken impression that memory "wears out", though it kinda does when their laptop repairman "fixes" their computer problems by upgrading their Win98 to pirated WinXP, without adding the requisite additional memory.
People, if you're running XP without 512 MB of RAM, invest the frickin $65 dollars to upgrade. It's worth it. It's the cheapest upgrade you can make... it'll feel like a new computer. Go to http://www.crucial.com/ and run the memory scanner and buy whatever it recommends.