My System Slow
my system has been working very slow since 6-7 weeks ago. Server status is normal and there is no download on the server. what is problem?

My System : AMD Athlon(tm) XP 3000+ ,, 1 GB Ram
installed programs on the server ; aPF & BFd & Mod_Dosevasive
Fedora Core 3
http://img206.echo.cx/img206/8391/cpanelstatus0tq.png