It is inevitable that hackers will look for vulnerabilities in Windows XP as it is very popular.
I probably wouldn't be affected anyway as I use a McAfee anti-virus and firewall and I can tell at a glance whether they are on or not by the colour of my McAFee Security Centre icon oin the Windows taskbar.
If it is red they are BOTH on and if black then one or both are off.
Since installing SP2 yesterday the only minor niggle I have is that when the anti-virus is disabled it still shows in the SP2 Security Centre as being ON.
The strange thing is that when my McAfee firewall is disabled SP2 picks this up and displays firewall as OFF in SP2 Security Centre!