forgot admin password in win 7

If you cannot do a clean install from disk or a recovery partition, contact Microsoft or possibly your system vendor if 7 came pre-installed.

For reference:
The members of TechRepublic - A Resource for IT Professionals and Riff Raff, will not assist anyone in the recovery of lost passwords. You may have a legitimate reason to recover a password. However, we cannot verify your motives and will therefore not assist anyone in what may be an attempt at gaining unauthorized access to a computer system. Due to the open nature of this forum, any assistance given to help circumvent security measures, even for legitimate purposes, would be available for unscrupulous individuals to use for illegitimate purposes. This is a risk that we the members of TechRepublic will not take. Please do not ask questions of this nature on TechRepublic. If you have a legitimate need to circumvent a password scheme, please contact the vendor for the software / hardware and request their assistance. E.g. Windows XP password recovery issues should be taken up with Microsoft's technical support, Phoenix BIOS password recovery issues should be taken up with Phoenix Technologies, etc.