You probably do not have enough memory to run XP. XP needs AT LEAST 512mB but will be better with 1 gB.
Next defrag you hard driver and finally get rid of any programs that you do not use. (Theyare probably loading 'stub's at boot time which is helping to slow everything down.)
Skilled PC people can do even more. However amateurs using the techniques cause damage to the PC.
T
November 2010