hi,guys and gals, im a rookie retiree with a new interest in customiizing a window xp pro os.i've made a fisrt desktop build,however this is much more complicated and i need to ask for some help and direction. i have a dell optiplex 755 with 32bit xp. this computer is a rebuild i bought on amazon. under properties it says sp3, but i'm not sure. in the add/remove i see microsoft.net framework 1.1 microsoft .net framework 2.0 sp2 microsoft .net framework 3.0 sp2 microsoft .net framework 3.5 sp1 microsoft .net framework 4 client profile, no referance to sp3. i've read that sp2 supercedes sp1 and sp3 supercedes both sp1 and sp2. as well i've run across a post in the wincert forums of an (unofficial), whatever that means, windows xp sp4. so im left confused on this and was hoping someone with some tech knowledge can give me some advice on what group of .net framework packages will give me a strong foundation from which to cutomize my xp. also i've been reviewing the impressive list of add-ons from the wincert list. any help or advice you can give this old rookie wil be greatly appreciated thx dewitt