[arandomasian]

I'm currently using the pinyin system to type Chinese but how do I input the Chinese period? That's the big hollow one.

And just out of curiosity, how do cantonese-speaking people type Chinese? Using bopomofo?

[Xiaoba1tu]

Given that you have switched to the Chinese typing mode, the Chinese period should show up when you type "." <-normal full stop button.
你好。(Chinese typing mode)
ni hao. (English typing mode)

[achu]

there is no pinyin system for canto ==.
so yeah.
basically to type in chinese, you have to learn mando.

[bliZZard -x]

Well.. it IS true that the IME system in XP doesn't really support canto...
But you can try using this:
http://www.mdbg.net/chindict/webime2.php?ime=jyutping_trad

It's a little troublesome i know, but this is probably the better way for now.