XP sp3, lost some critical DLLs. Unable to run utilities such as msinfo32.

I have Windows XP sp3. All of my non-system software working, IP broadband connection works as well. My problem is that I lost some critical DLLs. I've known this for about a year or two. I can't run MSINFO32 or other basic system utilities. Now I'm worried because I can't get MS Firewall online after removing the CA security suite and go MS Security Essentials. I can't use scannow, the System File Checker. It will not work. Please give me some suggestions on how to rebuild the system DLL.

pawneejeff,
Thanks for posting on the Microsoft answers Forum.  When you try to run SFC this error message you get?  Also, when you start the command prompt you you sure to right click on the icon and run as administrator.   You have access to your XP CD?  If Yes, you can boot from the disk and go in the recovery and then console run SFC/scannow from there.
If you are unable to run SFC, then you may need to do a repair of XP installation.  Here are the links that cover SFC and installation options.

http://support.Microsoft.com/kb/310747
http://support.Microsoft.com/kb/315341 Mike - Engineer Support Microsoft Answers
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