How to choose primary hard drive

i have 2 sata hard drives

320 gb


320 gb has windows 7 installed

1000gb has windows xp installed

when i turn on my computer windows xp starts loading.and i can also access the partitions of the other drive when i click my computer.question is how can i make windows 7 load?or how can i make the 320gb hdd primary?
motherboard:msi 760gm-p33
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