|"I have 8g computer and I have no idea how it is partitioned."|
Are we talking RAM or DiskSpace?
If it is disk space OMG go out and get a new hard drive. Those 8 GB hard drives don't last long and you are just biding your time with that ancheint drive. It could fail at any time now. Heck I have more than 8 GB of MP3 songs. Heck my IPOD has more disk space.
Just MHO, but if you want to clean your computer up, most probably there are temp files left over. Run a Disk Clean to remove them. You may also have leftover file in your Internet Cache. You may want to clean them out too.