Computer - want to buy an embled PC with windows xp?

details about computer configaration for windows xp, broad band internet connection (res. use) 256mhz or which wd suit ? install adobe 7.0 , mozilla firefox (wht are its benefit over int. explorer?). PRIMARILY ABOUT COMPUTER CONFIGARATION? (RAM, Mthr board, other properties to be known to deal with computer technichian) AND BROAD BAND TATA INDI CONNECTION (is it neccessary to get a tata ph. connection?)