This is what happened:

I had a dual boot, Vista and Ubuntu 7.10 Gutsy. Since Ubuntu had connection problems i decided to remove it and get a better distro. I read about the formatting of partitions being the only way of removing Linux but i didnt have any software to format partitions, so i used Vista to format the partitions, i must have done it wrongly or something because after rebooting, it had a black screen written:

Loading grub...

Error 17

And it just did not proceed from there. Now i couldn't boot my machine and i couldn't access anything.

Since i had an XP install disc i thought to put it and load the machine from XP. I installed XP, it showed me the two partitions that i had deleted (which it termed unallocated partitions). I used one of the unallocated partitions to install XP. After installing it, it also refused to boot. It just goes to a black screen with the cursor and nothing happens. How can i fix this? If i reinstall Linux back, will it boot and replace the grub loader?

I am begging for anyone's assistance, i do not understand where the problem is emanating from.

Use XP cd. Select recovery. Type fixmbr.

Because you format the partition L:inux is gone .
But GRUB is still im MBR
So you have to put Vista boot loader back in place
There several ways to do so visit helpdeskgeek.com/how-to/fix-mbr-xp-vista/
Or install a other linux distro