Dell E510 Re Installation

A little background to the problems I have had. At first I had the 1 2 3 diagnostic lights lit green and it would be a black screen (when I power on) and would not load windows nor the dell screen (could not access bios). I took the cmos battery out and this time it flashed the dell screen so I went into the bios and disabled the floppy drive as there is not one and it fixed the problem...(booted fine) but then something else went wrong. I got the flashing amber light. I had a 500W psu I bought for this system anyway so I put that in and again was able to get back to windows. I decided to do a windows clean install as I was also getting explorer.exe and drwatson errors. During Xp setup I selected L to replace the windows folder with the files on my windows installation cd. Apparently doing this removed my ethernet adapter and controllers so now the windows cannot access the web to update the installation. Now the Windows installation freezes and will not continue. I tried restarting the computer and it went right back to the windows installation and froze again. I restarted a 3rd time and this time I got a black screen that says x300xtbios p/n 113-a33-437-102. What does this mean and how do I fix this... I tried popping out the cmos battery again (not sure what I was hoping for there but figured it couldnt hurt) and now I am back to the 1 2 3 green lights being on and the computer makes 2 beep sounds on start up. Only problem is this time I cant seem to get the dell screen to come up so I cant get into the bios again like I did last time. All I wanted was a clean windows installation. What does the x300xbios stuff mean..why did that come up and what should I do now?