I turn it on. It beeps twice loudly and goes to a

I turn it on. After it goes through the ACER white page,it beeps twice loudly and goes to a black screen with white print. Among other things it says: network conflict: PCI network controller on Motherboard. I have to hit F1 to continue and it gets to the password page then flashes a dark blue screen with white print too fast to read and shuts down. Then immediately starts up again, beep, beep, black screen, hit F1, and so on. Just cycles like that. Then a couple days go by and I try again and it works! For awhile (days maybe) until something triggers the problem again.
I cannot use my ethernet connection to access the internet since this problem started. I now use a USB connection. Someone suggested I lost the drivers for the previously mentioned controller?? How would this happen and where do I get them again to download, if this is indeed the problem?