acer aspire one win 7 to xp

Greetings all, i have a problem with an acer aspire one which someone installed win 7 on. As you can imagine, it isn't running too well at all only having a gig of ram.
I tried installing win xp back onto it, but neither flash or external disc drive instalation methods pick up the hdd , any ideas how i can get xp back on this machine.
Apart from the sluggishness it works fine, sort of, so no idea why hdd isn't recognised.

Many thanks
 
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