is it beg different between win7 and 8?
recently i am using windows7 do you think i have to get it changed to wind8?
Yes, it is a big difference in how you do things, but not necessarily better.
No, you do not need to change.
Windows 8 will boot faster.
That is a negligible point if you have a SSD. If you don't have a SSD, spend your money on a SSD first.
Past that, some users have a problem with the metro interface.
Personally, I hated it.
If you have a touchscreen monitor then Win 8 is good for you.
If you don't mind getting RSI strain injury in your arm and elbow from holding it up and over the desk to touch the screen all the time, then go for it.
I can see it now, microsoft releases new range of arm supporting devices especially for Win 8, only $100 a time. Similar to a wheelchair hoist but designed solely for arms, this new equipment is rumoured to only take up a quarter of your desk space. Clear those coffee mugs now!