If you're removing a Linux distro from a dual-boot with Windows, you need to remove the Linux bootloader first, then delete the Linux partition. Never used 7, but in XP this was done by booting up the XP install CD, getting the recovery console, and running fixmbr (or something like that). Best thing, find out how to do that in 7.

If you have a Windows 7 Recovery CD or USB (made when you do a system image), boot it up and go to the command line. Then run: bootrec /fixmbr

This will put the Windows bootloader back on the MBR as if Linux never existed...

If you have deleted everything but the /boot partition, then simplify things for yourself and just select "Install Alongside windows". You can create a separate data partition later. And as pointed out above, you cannot share your /home partition with windows. You can create a data partition later and format it as ntfs so both windows and Linux can access it.

If you have just your boot partition for Linpus and the windows partition, there would be no other place to install Ubuntu than the 30GB free space so that should work and Ubuntu would install Grub to the master boot record and should create a menu with entries for both operating systems. Posting your actual partition info would be helpful. Use the Ubuntu installation media, open a terminal and enter this command:

That's a lower case Letter L in the command, post the output

Also, from what I can see of your posts, you haven't done anything toward installing Ubuntu yet, or have you?

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Thanks man for your kind response.
I just did what you said.I typed sudo fdisk -l and entered. It showed results like this.

device boot ID SYSTEM

/dev/sda1 7 HPFS/NTFS/exFAT
/dev/sda2 7 HPFS/NTFS/exFAT
/dev/sda3 7 HPFS/NTFS/exFAT
/dev/sda4 5 extended
partition 4 does not start on physical sector boundary
/dev/sda5 83 LINUX

Now what is your opinion ? Should I remove partition 5 containing linpus lite grub before installing UBUNTU as it has its own grub menu.AND IS IT SAFE TO REMOVE /dev/sda5 USING WINDOWS HDD PARTITIONER ?

You can remove it because ubuntu is going recreate / partition.

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I just saw this youtube video and it looks like it would apply perfectly here with your goal to remove the previous linux install and most importantly the grub menu. Note: I can't vouch for this personally, but this guy has an excellent reputation on his videos so it would certainly be worth getting some opinions on. Also, I would imagine that since you want to redo the dual boot, you could skip the very last step of expanding the drive for windows 7. So if this works, that unallocated space is where the new ubuntu would automatically install itself, and of course it will put in its own grub as always.

http://youtu.be/LSYGkSptSy4

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Hello guys !
I really appreciate your help and guidance .So thanks ....
Finally I installed ubuntu along with windows successfully.It's really great and has good inbuilt apps. As a novice I am facing some basic problems.But I won't bother you about this in this post.Again thank you all.....

After all that suspense, you're not going to say how you did it?

Seriously, you had some interesting issues that would be of interest as to how you resolved them.

yeh buddy,you are right.
It's quite an interesting story.At first I was worried about if something goes wrong and it was obvious. Tinkering with partitions,bios and grub is not a wise thing for a newbie.right.So I planned to buy an external HDD for back up. Later I dropped the idea.I decided to buy a new lappy. It took some time to choose which one.And finally I bought a HP pavillion g6 laptop as it was both a
budget friendly and performance option.Now come to ubuntu. First I back up everything.Then I removed the partition containing grub for linpus with windows partition creator. And at last I chose the install ubuntu along side windows option.It worked fine.

well that's how I installed ubuntu and got the second laptop.