Tried to Delete Partitions, Did Not Go Well!

Hello,
I am not a computer person and not sure why I tried this, but here it goes....
I clicked on My Computer, then on manage. One inside the Hardware I tried to delete 2 OS's I had on 2 different partitions. I thought all was going well, but when the box came up and asked me what size I wanted to make the partition, I selected the minimum instead of the maximum....
Now, I cant get to Windows, I only get the GRUB screen (LINUX I believe) and I cant even get to the C prompt.
I have tried a new install with XP booting from the CD, but it goes throught he begining of the process and then comes back and says it cant locate my hard drive????
HELP please!!!!!