I have XP media Center, Office 2007. At first I could download Office type files. Now I can't. I have a Compaq Presario that I got used. The seller gave me the recovery disc but when I try to "recover" I get a message; Can't find file D:\i386\WINNTUPG\NETUPGRD.DLL. Where can I get this file and could it be corrupted on my hard drive?