Just saw your other thread about the audio. Is there anything in Device Manager showing as "unknown"? Main one to look for would be "multimedia controller". If it is listed that should be the onboard sound. You can also try and install the driver
manually (same one I linked too previously), Device Manager - Install Driver - Vista Forums
That is for Vista but he same applies to Windows 7.
I think you will find that the biggest problem is the chipset on your motherboard, Intel 845E which was declared EOL (end of life) quite a while ago by Intel. As a result there are no drivers
for the motherboard (which are responsible for telling the OS what to go and do with itself in regards to any hardware installed), and Windows will only install whatever it has built in; probably just enough for most things to work. If that is what it is it would also be why you can't get the sound to install.
P.S. From your other thread you mention the gameport, and yes those are no longer supported under Windows 7 (or Vista for that matter). If it is something that you want/need to use, then XP is about your only option. If you don't need/use it, look in the bios and see if there is an option to disable it.