For some reason, we may want to revert back to M$ world from Linux LILO or GRUB.

It seems not easy as there's no documentation on how-to and Linux distros don't follow unique standard.

Quite some articles required you booting from Windows installation CD and initiate Recovery Console. (blah blah..)

 

But this is not always necessary, here's another workaround:

The first thing is to recover the MBR (Main Boot Record) with the tool Mbrfix.

MbrFix /drive 0 fixmbr /vista        Update MBR code to Windows Vista

Then, initiate disk manager by click Start->Run: type diskmgmt.msc then Enter.

Select the unrecognized partitions and remove Logical Drive.

Reallocate the free space to M$ Windows, Safe and Sound.