Error message

Error message
"Windows\System32\config\system" file missing or corrupt
Boot using Windows Setup CD and enter into "Recovery Console" by pressing "R". Now Log in2 windows installation and enter admin paSword. Now give following commands at prompt:
copy %windir%\Repair\system %windir%\System32\Config
If it doesnt work, then again boot into " Recovery Console" and give following commands:
fixmbr
bootcfg /scan
bootcfg /rebuild
fixboot
Win XP Twweaks
START UP

*  I can't see Hidden files/folders in my computer. Even I enable the option "Show hidden files/folders" in "Tools -> Folder Options", its automatically disabled again.
Solution1: Go to your Start menu, click on Run and open up your Registry Editor by typing "regedit" without the quotes and pressing OOK.
* Once there go HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folde r\Hidden\SHOWALL
Delete the value CheckedValue. (Its type should be REG_SZ and data should be 0 or 1.)
Create a new DWORD value called CheckedValue (same as above, except that the type is REG_DWORD) by right clicking on the right pane->New->DWORD Value. Modify the value data to 1 (0x00000001).
Solution 2: Open regedit and goto:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
In right-side pane, change value of "Hidden" to as following:
* - 2 show hidden file
* - 2 not show hidden files
If it doesn't work, then scan your computer with an anti-virus software