What is the System File Checker, and how do I run it?

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I just successfully ran System File Checker on my custom built PC using my Windows XP Home Edition master disk. Interestingly, the disk would not run in my CD drive, but ran perfectly in my combination Benq DVD writing drive. After the System File Checker ran, I saw no error messages. I have been trying to solve a problem, trying to determine why my front USB ports have stopped recognizing my Digital Concepts card reader/writer.

I have my Windows XP Professional on a DVD. The SFC runs close to the end and then asks for Windows XP Professional CD2. I don't have a second CD since it is on a DVD. I click Retry and it doesn't accept the CD. How do I get around this?

I am responding to my own post. I did more searching and found that the files that SFC wasn't able to find and asked for CD2 don't exist for Windows XP Media Center 2005. Here is a Microsoft article that says what should be done. http://support.microsoft.com/kb/909059

Hi Leo,
I recently had a nasty Trojan called Prunnet.exe.
I used various programs to attempt to remove it, which i think has been done successfully.
Anyway, after running the anti-virus/anti-malware programs, I've been getting error messages, and once my computer shutdown because some vital system processes were not running.
I think that the anti-virus programs may have deleted some system files, so i ran system file checker.
After the scan, the scan completed (to my knowledge), but the small "windows file protection" window disappeared.
Does this mean that all the system files are intact and undamaged?
I anxiously await your reply.

...hey, mr. leo... i dunno if this is a virus or what, my laptop got an autorun thing... and i can't delete it, i have an anti virus here but that autorun thing keeps invading my file, even my usb and cp were infected... what should i do>?

I just found this site and so I'm new to finding information here. I was wondering if Mike Creel's question posted on 1/28/08 has been answered and if so it would be great to read it. His question applies to me as well.

i cannot send e-mails it constantly asks for identification via distorted letters numbers etc even though i correctly identify them

Leo,
I have only the original XP Pro CD.
Usually this is useless because if I try & use it my system always says "the installed version is more recent".
So for just about EVERYBODY, who has the nearly 100 XP updates, including SP2 & 3, surely the advice you offer, to try & use the original CD is useless.
This is the second comment on this topic which I hope you see fit to address.

I Secode Peter Owens Comment from March 1ST 2009. Please address this issue Leo.

Leo, I installed IE 8 on my XP mach. Didn't work. Removed it and IE 7 wouldn't work. Removed it IE 6 worked. Reinstalled IE7 and all fixes & SP3. Works fine. Outlook Express now has a prob. Cannot open any links from outlook. Ran SFC /scannow. Ran to completion no problems. OE still not working for links. Any ideas?

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