I have several computers all running XP Home Edition.
In the past I have found the various patches hit and miss.
Some patches have negated the tweaks performed in Tweak XP (or other tweaking packages) including the autologon feature.

I was very wary of SP2 so as an experiment decided to only install it on my laptop. It messed everything up and slowed it down considerably..and this a machine with 512 mgs ram and a Pentium IV 2.6

Because it was so messed up and in spite of running 'system restore' which did no good ... I reformatted the hd and installed my original copy of XP Home... I DELIBERATELY didn't get ANY of the cumulative patches or SP1 or SP2 and guess what? It runs beautifully and... FAST.

I have everything going through a firewalled and completely "stealthed" router at home, and when I am on the road I just enable XP's built-in firewall for dial up or hotel DSL connections and everything works great.

I am so glad I didn't install it on ANY of my other computers.
My verdict .... a big thumbs down to SP2.