Speeding up the computer

Hello, i saw a ad on the the TV the other day for a web site called my fasterPC.com and was wonder if this would speed up computer or not because i do not have the money to buy more ram chips and do not want to waste my money on a program that does not work. so i was wondering if anybody has used this program and could give me their thoughts on it, and if it is worth what they are asking for it.