Blue Screen / Safe Mode on Start Up

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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.
 
Those beeps most likely belong to the BIOS error beep codes. Do you know what BIOS this PC has and can you tell us again the beeps whether they are long, short, or both and what the pattern is?
 
Black screen only

Right after I had posted this originally, I needed to power cycle again because the computer froze. After that power cycle the computer made one or two short beeps upon start up and goes immediately to a black screen that states driver "0" not found.

I've tried power cycling at least 25 times, but it will not work properly. Any ideas?

I have no clue how to find out the BIOS.
 
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