The question/situation isn't entirely clear to me. If you're saying that there are two computer assets for a reinstalled computer and that the software counts are incorrect as a result, I'm assuming this is because you reinstalled the computer under a different name. A Windows computer's internal ID is its computer name/domain name combination. If you rename a computer, a new asset page will be generated for it. You can prevent this behavior by enabling rename detection under Configuration\Server Options. To delete any duplicates that have already been generated, follow
these instructions.