Hi GUYS!
well...i have installed ubuntu 11.04 but was previously using windows 7 ultimate 64-bit and when installed the ubuntu OS in my computer i didn't replace windows
but installed it in a WAY that i  can switch to windows and ubuntu when login in.
But the problem comes when i start my computer it goes straight to ubuntu and never give me options of the OS to start up with!
Am using Hp pavilion dv7 - 4077 cl entertainment notebook!!..
please anyone who can help me!!? err... you have overwritten the master boot record to boot to only ubuntu. You should have used the Wubi installer to install Ubuntu under Windows 7 so you can dual boot without hassle.


What the Wubi installer is.
http://www.ubuntu.com/download/ubuntu/windows-installer


I would suggest this:
http://www.ehow.com/how_4836283_repair-mbr-windows.html
Repair the Windows installation so you can boot into windows 7, delete the ubuntu partition, then use Wubi under Windows which will AUTOMATICALLY setup a dual boot, considering that ubuntu is freshly installed and that you probably don't have any important files on ubuntu right now...Repairing your Windows Installation by using the Windows 7 DVD will do the job, like Transfusion had previously suggested.There is no reason to use the DVD. Install grub.What Mr Bisquit said.  The OP didn't say that the Ubuntu installation was to be nuked - this is a dual-boot scenario.  Go for Grub 2.  You may NEED to RTFM to get the entries correct for the Windows startup if it hasn't been detected automatically...GRUB should already be installed.

musamanyama, what happens if you hold down the Shift key as the computer is starting up?well...JJ 3000 i have hold shift and nothing really happened and i have try 2 download the software on the Transfusion link as he suggested and am expecting good results...i will notify 2 when it get done!!!Looks like there's a fix here:
http://forums.scotsnewsletter.com/index.php?showtopic=45226Oops!!...that did it!!..hahaa...yeah i was trying 2 mess with ubuntu terminal but never went that good!!...thanks JJ!!Never thought combination of Ubuntu and Windows is that complicated , i haven't tried it i only have before the Windows 98 and Xp it is indeed easy to use.