I've installed it twice and uninstalled it again both times, as it completely blocked all internet connections even though the firewall was turned off!
I had it running for about 3 weeks without problem, then it just decided to stop working. Luckily I had another PC on my home network to check if it was the PC or the net connection. Uninstalling SP2 brought it all back up.
You may have different results, but this is my own experience having installed it on the same machine twice, and got the same results.
i know even less about computers than most things but i installed it; thought that is what you are supposed to do!; and havnt noticed any differences so far.
I did a fresh install of XP with SP2 slipstreamed in. Seems to be a safer way rather than applying SP2 as a separate patch. No probs on 2 comps so far.
I installed it and it seems to have seriously slowed down my wireless internet connection, but turning the firewall off seems to have fixed that.. other than that, I haven't noticed much different... Maybe I'm missing something...