Hi, for the past 6 months my Dell Dimension 3000 has been running fine. For the past 2 weeks it has been very slow opening programs and freezes after about 30 minutes. I have run AdAware Pro, Windows Defender, SpyBot, Norton AV and nothing is comming up. I took my case off, vacuumed all the dust and cleared the fans from dust. Installed EVEREST and PC temp is 25C and 77F. PLease HELP! I am OK with software applications but please walk me through techical stuff if you can recommend something. THANK YOU!!!