That system had a Celeron processor on many and as such, if you're using Windows XP with 512 MB of RAM.... or the Vista model with 1 GB or RAM, then you'll want to increase the RAM to double what you have now..
Next, try cleaning out all the junk on the computer and eliminate the unnecessary startup programs that may be robbing the computer of resources/memory. First, uninstall all unnecessary programs. Next, use Start-Accessories-System Tools-Disc Cleanup/More Options tab to eliminate all but the most recent System Restore points. Click on the link below and follow ALL of the steps listed.. It may take a while to get them done, but it should speed things up a little:
Hope this helps.
I have an Aspire 5315 PC which I've had for 2 years.
Just recently though its been incredibly slow. My hard drive is 80GB split between C and Drive.
My C drive says it has just 5GB left (out of 32GB) which is odd as I save nothing on my C drive. All my documents, music, photo's etc are saved on an external hard drive.
When I open windows task manager there's seems to be a lot going on. I run Norton and have the live updates.
It's started to become really frustrating as the PC is about as fast an arthritic snail.