Somehow windows xp C:\Windows\Logs\CBS Log\CBS folder is missing in c:\windows?

you will have to give more information:

how do you know that it is missing?

What steps have you performed?

Click Start > Run > type or paste msinfo32 > OK. Copy and paste the contents in your reply.

also state what your current antivirus is.

Hi,

Considering the age of the thread, avoid confusion and to get better exposure on the forums, I would suggest you to create a new thread with the details.

Post your query in the Windows 7 forums.
 
Refer to the link-
http://answers.microsoft.com/en-us

Also refer:

http://support.microsoft.com/kb/555375/en-us

This article offers suggestions for how to phrase the questions that you post to help forums and newsgroups

sfc does not produce a scan log

if it had to replace files or someone tried to change a file there will be an event in event viewer, WFP

I am of the notion that suggesting sfc /scannow is akin to saying "I have no idea what the problem is or how to fix it".

sfc /scannow is designed to run one time when you install XP.  The purpose is to populate the dllcache folder with backup copies of important XP files.  Sure - you can run it manually if you want.

sfc /scannow does not replace missing or corrupt files in the system32 folder.  It only cares about the dllcache folder.  If you would like a little test case where you can prove it to yourself, I can post that (I composed it in hopes that the Microsoft engaged Support Engineer "experts" would stop suggesting it).  Then you will know what sfc /scannow does and what it doesn't do.

Even when sfc /scannow runs successfully, you will only see a starting and complete message in the Event Viewer System log that looks like this:

Event Type:    Information
Event Source:    Windows File Protection
Event Category:    None
Event ID:    64016
Windows File Protection file scan was started.

Event Type:    Information
Event Source:    Windows File Protection
Event Category:    None
Event ID:    64017
Windows File Protection file scan completed successfully.

There is no information about what it did or what it didn't do.

Even if sfc /scannow finds something to do and replaces a file, you will not know about it, but you will have wasted your time and still have your original problem.

That makes suggesting it or trying it even more of a waste of time.