Not to tell you what you already suspected but are you sure you did this proper? BootCamp required XP SP2 and installation while easy was still a few more steps than most like. For instance those drivers.
Are you sure it is "XP" that you installed?
NO I am asking what was used for the install, not what it reports after you update.
I have Windows XP running via BootCamp on my MacBook.
Occasionally, when I double click an icon to launch the program, the properties menu of the selected program will launch instead of the desired program. (For example: If I double click the Firefox icon, the Firefox "properties" window will launch.)
Also, when I manually open this program from either the start menu, or Run program, the application is unable to use the keyboard. Such as not being able to type in a web address in Firefox.
I also think its important to say that a restart fixes these problems, but not a log out and back in.