No startup disk for windows in preferences on Mac

I re-installed Snow Leopard, an already had a Boot Camp partition for WinXP Home SP3. All went fine but...
There's no startup disk icon in startup disk options on the Mac.
Sometimes I hold down option key to chose Mac or Windows and it's fine, bit if I boot to windows, the next time it auto boots to windows everytime, even with key held in. I then, in windows, chose boot camp icon in taskbar and chose "restart in Mac OSX" and it does.. Now however it boots to Mac everytime!
I didn't do a re-install of the boot camp partition, as was all fine installation wise after I did with Snow Leopard.
Anyone help please
Cheers

Still having bother with this, can anyone help please.
The Windows disk doesnt show up in Mac OS on "startup disk preference", when in windows boot camp, both the Mac OSX and Windows partition show up.
Sometimes if I boot into Mac, I then cant boot into Windows via the "option key", if I've been in Windows, I cannot get to Mac with option key, have to goto boot camp options and "restart in Mac OSX"
So something is messed up, can anyone help please? I use Mac and its fine, but kids use Windows, and when I'm not in it doesnt work, so its difficult to explain over phone.
I have a wireless keyboard and it seems it doesnt switch on when booting up iMac, so the option key isnt detected - again randomly
cheers

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