umm i believe i have a work around not a fix but a way round it
i think n e way
next time your browser will not open try this
press CTR ALT DELETE
when task manager comes up click on processes
then click mem usage twice (so the programs using most memory are at the top)
and look to see if you have a SVCHOST.EXE using above 30,000 ish
if there is click it and end process and try open IE again
im having same problem on my family computer i need to really reformate and reinstall xp too many things wrong with it