I installed windows 7 ultimate, i did not just upgrade I did the more advanced install. I iinstalled it on a HP pavillion g series that was already running windows 7. I did back it up fully. However, the problem is that it is now not recognizing a properly installed network adapter.
By wiping out the previous install (i.e., doing a clean install) you wiped out the drivers that were installed also. You need to download and install the network driver for Windows 7 (32 or 64 bit as appropriate) from HP.