are you booting the cd or the hdd
you could run fdisk /mbr
that will repair you mbr to make windows run again
you will have to edit your boot.ini to make ubuntu work again

I've tryed the fdisk/mbr and now i can't even format my windows
partition with the WINXP CD...but i can format with Ubuntu:)

I have a winxp system on a drive of 37.26G with 19.75g free. There are two
'unmovable blocks' about 3/4 of the way on the defrag screen. I have defragged
and gotten most of the files in the first 1/2 with the exception of the
'unmovable blocks'. I was thinking of dual booting with Shackbox by F0FAK which
is based on Ubuntu. Apparently the install will set up dual boot but my question
is -- if I make the partition 10G and some or all of the unmovable block is
within that portion how will ubuntu/winxp treat that info. I don't want to loose
it and I'm not sure how small a partition I can make available for shackbox. Any
help will be appreciated.

I suspect the "unmovable" blocks are the swap file and the hibernation file. If
you don't use hibernation on that machine you can turn that function off and
that block of disk will be freed up.

Do you have another drive to move your windows swap file to? If you do, then
you can do the Linux partition, then move the swap file back to the Windows
partition.

The "unmovable" blocks will actually move into the reduced partition
when you shrink the partition and install Linux. If you want to check
this out, just use the partition manager on the live CD to shrink the
Windows partition and see what happens.

Thank you very much for the information re the unmovable blocks. I think
I shall give it a go and see what happens. And yes I do have a 20G hard
drive available so I may add that to the computer if there is room )its
an IBM Netvista type 6792.