Recently I noticed that my c:\windows\system32\drivers\atapi.sys file (File 'Drivers\atapi.sys': Ver=5.1.2600.1106 (xpsp1.020828-1920), size=86912 bytes, created 29/08/2002 1.27.50 (Adapter driver for rec) ) is replaced with an unknown version:
File 'Drivers\atapi.sys': Ver=?.?.?.?, size=86912 bytes, created 29/08/2002 1.27.50 (Adapter driver for rec)
If I delete this file WindowsXP will replace it with the right version but if i reboot the system it is again replaced with that unknown version.
I've also checked my c:\windows\system32\dllcache\atapi.sys and it seems the good version, same thing for c:\windows\LastGood\system32\drivers\atapi.sys
This doesn't seem to lead to any problem and the two files seems to be identical.