Hello Guys I am sorry for Not Been Very computer smart!! Well i have dell demension 4400 with 640mb of ram with windows xp and a tiny hard drive my questions are.I Get this when start up!! Still works Fine Though and i Really do not have the Money to buy a New one right now!! #1.No virtual Memory when i boot up?? #2.is this Thing Worth investing the money to upgrade the hard drive and what would you recommed it?? and what will work on this.and #3.is the CRT also worth replacing or installing a new flat Panel?? Well to be honest i am a Brain Tumor Patient and not very computer savy no not to sharp but i will try anything because i really dont thing it is that complex. thanks.