It's more often choices we made as to how much runs at a time, once in awhile issues with antivirus choices (Free AVG?) or malware. Try a few of this forum's favorite freebies like...
I am running windows XP and I just wanted to know if there are any good Registry Cleaners. My computer is running slow and I assume that that is what I need to do to make it pick up. My internet is slow (I have shaw Highspeed), programs start slowly, and my computer just doesn't respond as well anymore.