Your are using an older (slower) computer, though nothing wrong in itself, is barely able to manage current anti-malware programs.
Many of these, not least AVG have become bloated and need more power to run than they did 5 years ago.
What stands out for me is the figure 288 for RAM.
You haven't said which OS you are using.
If it is XP or older, then you could try upgrading the amount of RAM.
If you are using Vista or Win 7, you are IMO faced with a truly difficult problem.