I had the idea to dual boot Win 7 and Ubuntu and what I did was the following:

Made a clean install of win 7 using all of my hard drive, next I used the Ubuntu live cd and gparted to partition my drive to be the following:

/dev/sda1 ext4 20GB (Linux root)  
/dev/sda2 ntfs 100GB(Win7)  
/dev/sda3 ext4 350GB(Home)  
/dev/sda4 extended 4GB(swap)  

The thing is, when installing ubuntu I deleted the partition win 7 creates for its boot sector and recovery and then resized the drive to look like what I mentioned, and Ubuntu installed GRUB to the MBR.
When GRUB boots I can see Ubuntu but not Windows, how can I chainload it? Or should I fix the windows mbr with the windows 7 installation disk and try to set the dual boot from there?

I don't really care which one of the 2 bootloaders I end up using, I just want the dual boot to work out.

Thanks