Windows 7: I tried deleting Linux partitions

I was wondering if anyone can help me with my problem.
I installed Zorin OS 5.2 (Linux) along-side Windows 7.
And then i found out about Windows 8 Developer Preview, and decided to give it a try.
So now i want to delete Linux and Dual Boot Windows 7 and Windows 8 DP.
But there is no Uninstall option in Linux. I tried deleting Linux partitions (theres 2 of them)
and when i restart, it shows me the black screen, saying "Error: Could not find partition"
"Grub help: _" Something like a command prompt. And then i can't boot into Windows 7.
I was recently reading something on the internet and found out that Linux Grub Boot Loader messed up with MBR on my Windows 7 partition.
I had to install Zorin OS 5.2 again, just to be able to boot in Windows 7.
If anyone can help me with this problem, I would appreciate it, or at least help me with making Windows 7 primary OS to boot in.

In the meantime. Someone may post a better solution. But I would remove linux and then follow this tutorial.

MBR - Restore Windows 7 Master Boot Record

Mid way in this tut there is a link to MS that will help also.

For Linux
To Remove Linux take look at this post:
Error 0xc0000225 on boot

For Windows.
The best way, would be to dual boot Windows 7 & Windows 8 is to follow this tutorial:
http://www.eightforums.com/tutorials...s-7-vista.html
you can than delete Windows 8 very easily, using this tutorial:
Dual Boot Windows 7 and Windows 8 - Delete Windows 8 Developer Preview - Windows 8 Forums