Intel(R)82845G/GL/GE/PE/GV Graphics Controller
ah, the good old intel 845 chipset, i had one of these for a while, installing ubuntu on it was a nightmare because of the idiot way they rigged the board up.
the 845 is a very old integrated graphics chipset these days, and its support always sucked.
if memory serves, the 845 was primarily an OEM board. what you should prolly do is go to your OEM's website (dell.com, hp.com, etc) download the graphics drivers for your model computer, uninstall the old ones, restart, and install the ones you just downloaded.
another possibility is your RAM. as an integrated chip, the 845 snags some of your system RAM. if you never got more RAM for that computer, and you just have what the OEM ships (considering the timeframe, you'd be lucky to have 1GB) this could be compounding the issue.
..... wait a sec. you are running win7 on a 845?
no wonder you are having problems, nothing about that board supports win7. you are likely under or right at minimum specs for the operating system. no wonder you are having issues.
consider going back to XP or running some lightweight distro of linux, lubuntu for example.