Big problem with HD

[Rajito]

Hey all,
I did something wrong,
I re-installed ubuntu, but when i restarted my pc, i got a grub error, and it couldn't run any other operating system.
(on the hd there was windows xp, 7, and the newly installed ubuntu.
So i wanted to delete the ubuntu again, but when i did that
i think that i deleted my windows 7 partition to.
(i think i clicked delete on the windows 7 partition, but it needed to be the ubuntu partition.)
Because when i restarted my pc, the error was there still.
I booted my pc from the ubuntu live cd, then i click try ubuntu.
There i could only see the files from my xp (which is nothing, xp is just for gaming)
I coulnd't see any stuff from my windows 7 partition (and all my important stuff is on that!)
Is there any way to get it back?
When i wanted to delete my ubuntu partition i clicked on delete NOT format.

I didn't backup my pc.
Please help if you can.

Thanks in advance.

---------- Post added at 11:45 AM ---------- Previous post was at 10:59 AM ----------

i used this:
Active@ Partition Recovery. Recover Deleted Partition. Undelete NTFS & FAT partitions. (demo) and after scanning a long time i could see my partitions & files from the my D Harddisk.
But to recover i need to purchase it -.-
Now i'm searching for a free software that can do that, but now i'm "happy" because i know that the files are still there :)

[MentaL]

[Rajito]

I need to pay for that.
I don't want to pay for it if i only use it once.
Does someone knows a good free partition recovery program?

[Warmonger]

I need to pay for that.
I don't want to pay for it if i only use it once.
Does someone knows a good free partition recovery program?

Why not search for it cracked? You already know it works, and how to use it. So why not.

[SkylineMaster]

I would recommed to get it cracked search google, or to format the partition and leave it in blank with no OS or files then USE EASEUS Data recovery in and it will recover all the formatted files :)

[Rajito]

Found the cracked version.
But when i want to recover it, it says unable to rewrite boot sector.
does someone know how to recover it?

Otherwise i only have 1 option left, and that is to use easus data recovery.
But with that i can only recover 1gb,so i hope that all the important files are less then 1gb, then i just need to re-install the os.