I recently changed my os to windows 7 from windows xp it’s very much different and user friendly to use but when I check the disk space it shows only 20GB free space out of 150GB. So I am trying to break partition of the hard but I couldn’t find any option to change. Can please share your comments below to create partition in windows 7.

You have to shrink it first before doing so
The place you are looking for is disk management,
Shrink it first select the number of bytes you want, after shrinking you'll see the new shrinked partition right click and do the rest

Note if would change your hard disk from a basic disk and if you have a hp laptop ...... Wait no need for this nevermind since you have a XP laptop which I guess came with the laptop so you should be fine

milahenner: I recently changed my os to windows 7 from windows xp it’s very much different and user friendly to use but when I check the disk space it shows only 20GB free space out of 150GB. So I am trying to break partition of the hard but I couldn’t find any option to change. Can please share your comments below to create partition in windows 7.

You are already running low on disk space. Why do you want to create another partition? Are you trying to meet certain need?