GRUB Update - Squeeze Installation

[Roman Gelfand <rgelfand2@gmail.com>]

I have workstation containing both windows vista and debian lenny.
The boot manager was grub.

I had since removed ext and swap partions that housed debian lenny and
installed in it's place debian squeeze using usb netinst.  The
installation process saw windows vista and installed grub.  However,
the mbr doesn't see grub now, I get "no bootable device found".  BTW..
the ext3 partition is bootable.

Is there a way to use usb netinst to fix this?

Thanks in advance