8) ...do these.....

as suggested above "msconfig"...remove everything there except enteries related to antivirus.

msconfig again...remove unwanted processes..

delete temporary internet files/clear history.

disable XP themes...

defragment the HDD

If u have created some users,delete them except admin

clear some fonts from fonts folder....

try out "bootvis" a utility by XP itself.....check it out on
http://www.weethet.nl/english/hardware_bootvis.php
ALL THE BEST!