Hello! This may be a repeat question, but I was getting a headache trying to read through all the threads to see if anyone had answered my question, so here goes... I have a Dell Optiplex '04 biz pc. I received this from a friend and for the first 3 wks everything worked fine. I was told a new hard drive was installed for it to work. Eventually I must've picked up a virus and I was receiving the black screen about safe mode. When I chose any of the available options, it would act like it was starting windows, but would go back right to that black screen. I had a friend "fix" it but right when I went to add the wireless disc (for the usb adapter) it went right back to that black screen. I then had the computer sent to the original person that "fixed" it in the first place, also claimed to have replaced the hard drive. I received the computer back and it was working fine. I downloaded Firefox and a few add-ons, but that was it (besides the wireless disc so I may access wireless internet). But here are the problems I am encountering: After I was prompted to plug in the wireless usb adapter (to finish the set-up process) I got the blue screen of death. I then restarted the computer and it went to the black screen. I was so angry I just shut it off and said eff it. I then restarted it 2 more times, go figure the second time no blue or black screen, everything seemed to be working fine. I then added Firefox and a few add-ons, they loaded fine but about 30 mins later I got the blue or black screen, can't remember which one. I restarted the computer until it worked properly (2-3x). I was just playing around on Facebook and Myspace for a bit and everything was fine, until about an hr later I got a different black screen, this one had an error about something missing with the hard drive? But after 2-3 power cycles, it started normally. I was under the impression that if I stayed off porn sites and other places that I would normally expect a virus, spyware, etc. that Firefox had built-in protection and I should be fine. Is this not good enough? I downloaded the trial version for Norton and it found 17 tracking cookies but that was it. Nothing malicious and no viruses. I am able to use the computer for over an hour at times maybe up to 2 or 3, but then I have an issue. I also noticed that 2x now the screen saver froze and I need to reboot. I have attempted ctrl+alt+delete, but it will not work. Actually, now that I think of it, this was the first problem I had, it was freezing on the screen saver and on homepages. I know I didn't give you the details on all the error msg's, but I will write them down now, if they happen again. I just need this pc to get me through a few more months, then I'll buy a new one. Please help! Ok, so some of you read this, but no one has offered any help Here's what happens now...The computer makes a one or two beep sound upon start-up then automatically goes to a black screen that states that drive 0 is not found and I have an option to hit F1 to reboot or F2 for a menu. Neither option works. I was able to power cycle a few times and eventually it would bypass this screen, but now after 10-25 power cycles I think it's safe to say it will not bypass it any longer.