These are Updates installed for patching up critical flaws and recommended updates for XP.
With today's threat of worms/parasites/viruses it's best to apply all critical updates to protect your PC.
When the next SP2 rolls out all these Hotfixes will be combined into it and they should be removed if you install SP2.
For now I'd leave them alone.
what is hot fix? i found that I have alot of Hotfix messages while i was brosing the add and remove program of my computer, Im using windows XP, can i just remove these by deleting it, whats going to be the effect to my computer system