[Sure]

I use Windows XP.

Suddenly I have started getting Error Messages.
On starting up, I get a message,
"The file or directory C:\Windows\system32\drivers\fidbox.dat is corrupt and unreadable. Please run the Chkdsk utility."
I ran 'chkdsk c:/r' through Start- Run. I get a message that "The system is NTFS. Cannot open the volume for direct access."
When I continue to use computer, ignoring the messages, I am able to open and use programs, but keep on getting Balloon messages:
"*.exe - corrupt File
C:\Windows\system32\drivers\fidbox.dat"

"*" keeps on changing (chrome.exe - corrupt File, AdobeCollabSync.exe - corrupt File), depending on what program I am trying to run, or is running in the background.
But the programs run without any problems.
Can somebody help please?

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Go Start>Run ("Start Search" in Vista), type in:
sfc /scannow
Click OK (hold CTRL, and SHIFT, hit Enter in Vista).
Have Windows CD/DVD handy (with Vista, most likely, you won't need it).
If System File Checker (sfc) will find any errors, it may ask you for the CD/DVD (rarely in Vista case).
If sfc won't find any errors in Windows XP, it'll simply quit, without any message.

[Broni]

Go Start>Run ("Start Search" in Vista), type in:
sfc /scannow
Click OK (hold CTRL, and SHIFT, hit Enter in Vista).
Have Windows CD/DVD handy (with Vista, most likely, you won't need it).
If System File Checker (sfc) will find any errors, it may ask you for the CD/DVD (rarely in Vista case).
If sfc won't find any errors in Windows XP, it'll simply quit, without any message.

[Sure]

Thanks for the suggestion.
I tried to run sfc /scannow. The system asked me for the CD/DVD. When I put it in the Drive, the system rejected it saying, it is not the same CD.
So what else can I do now?

[Broni]

What CD did you out in?
It has to be Windows XP CD with the exactly same service pack as installed on your computer.

[Sure]

Problem got resolved!
I started the Computer today, and it went into Check-disk mode on its own at boot-up, without any command from me for it.
It gave all the drives a thorough check, went through some five steps and reorganized the system. I have stopped getting the annoying prompts thereafter.
Still thank you very much for the prompt advice. By the way I had used the same CD with which I had upgraded to XP.

[Broni]

Good news
Thanks for posting back.

BTW, you can't use upgrade CD to run sfc.