i have some problem with my laptop. i hope there is someone would be able to help me.my hard disk has 120 G. i only used less than 50 G. however, my hard disk shows that i only have 265 MB left. A sign always comes up and says you do no t have enough memory. Also, i have an anti -virus program which is AVG.. i installed it but in the firewall, it says there is no any protection in the laptop. However, it stills update by itself. So i wonder that is my laptop has virus. i asked my friend for help. we thought that the laptop may have Trojan Virus, but it doesn't. my memory keeping used up when i doing something!! what should i do?please can someone help me?thanks