See this thread.
In other words, uninstall Folder LockBox, and see if the problem resolves itself. MPRIFL.SYS is a file associated with Folder LockBox.
ok...but can you recommend me any other folder locking software for locking private data? coz I hv tried "Folder Lock" and it too gives BSODs....plz do recommend an alternative.. thx in advance
Truecrypt can create an encrypted "volume". Kind of like a virtual hard drive that is fully encrypted. You mount it with Truecrypt and provide the password/key and it allows you access. You can use it for anything and it even works on flash drives.