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I don't want to lose any data or else i would installed them again. There must be a way to increase the partition size.

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Are you asking how to resize the Windows partition? – Mitch Jun 4 '12 at 12:19
Could you be more specific about providing info about the partitions and free space .Please take a look here , is this similar to your problem. – atenz Jun 4 '12 at 12:41
up vote 2 down vote accepted

You should use Gparted, a great disk partitioning software.
It is recommended by many people.

Download it from here
Download the .iso file and boot from the live cd
You can move, re-size, copy. delete, create, etc partitions at will.

Another alternative you have is to boot from an Ubuntu live cd/usb and use Gparted from it.

Note - Although the download link says

Editing partitions has the potential to cause LOSS of DATA.

That is not much encountered. As long as you are resizing onto an empty unallocated space you are safe.
I myself have done resizing many times and have never ever come across any data loss.
Well, if you are a pessimist or tend to get a bit panicky at times, i would suggest a back-up of the most important data.

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I did what you asked, booted from the live cd of gparted. I lowered the size of ubuntu so available 25 gb space created. But i can't resize the size of windows. It keeps saying the maximum is 50 gb when i have 25 availbable gb space.. if u want a screnshot i can show u... – Leon Vitanos Jun 7 '12 at 10:15
@Bong.Da.City see if these helps… – Ashu Jun 7 '12 at 16:36

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