I thought my computer was slowly crashing, DOS no longer worked, everything was slow, some progams disappeared, Windows Media Player could not find my sound card, programs randomly hung up ("program not responding") was very frequent. Then, OneCare found and deleted not one but several copies of Trojan: Win32/Delf.ER. It took over an hour to do all the cleaning, I rebooted, and my programs and systems returned! Now, can someone tell me what happened? I could not find this virus on the internet so I don't know what other trouble it may have caused me. I know I'm going to change a lot of passwords for starters.