Windows XP SP2: Problems with attrib.exe

Every time I start my computer, I get an error message that says Windows is unable to find “Attrib.exe” in my C:\Windows\system32 file. And the file is indeed missing, but how do I fix this? What is the purpose of that file?? My computer seems to working fine without it, but how do I restore the file so that I can stop getting that error message??

Thanks!