How many cpus can you install an OS on?

Building a new rig, bought everything going to have it put together now, question is, can i use my windows 7 install disc? (ive used it on my old build about 3 times) or do I have to buy an entire new disc?
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More about cpus install
  1. You can use the same disc. You may not even need to reactivate but if you do there is a number you can dial to do it over the phone.
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