Solve : SYSTEM FILE CORRUPT WINDOWS/SYSTEM32/DRIVERS/SERIAL.SYS HELP

1.	Solve : SYSTEM FILE CORRUPT WINDOWS/SYSTEM32/DRIVERS/SERIAL.SYS HELP !?
Answer» first of all cant go back, i already make the mistake of deleting files.. for more room, clean up.. upset now i did that, dont have a disk, back up and my computer KEEPS shutting down all by itself , in device manager says NON plug n play file and it is the file above with yellow and an exclamation point .. no cash, unemployment and need to get this fixed, monitor i thought blew but maybe it was this file that caused my problem with shutting down .. new borrowed monitor .. i really need to fix this asap before i lose my computer ... please help this blondie windows xp media center addition service pack 3, version 2002 my PRINTER is not hooked up .. and my DRIVE wont work for the new hp dvd writer i installed either Do you have a Windows CD ? ?

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