I am using a old PC which is 650MHz
If I installed XP and install all patch before SP2. Will it slow down my PC?
MS say that a 300mhz processor and 128 meg of ram is enough to run WinXP.
I would recommend an absolute minimum of 256 meg of ram to run winXP...your processor is fast enough.
service pack 2 shouldn't make a difference to the "speed" that winXP operates...