windows 8 or windows 7 ultimate

Solution
First, you do not need Windows 7 Ultimate. Home Premium or maybe Professional.

Second...."i heard lot of bad things" is exactly the same things that have been said about every single OS release from Microsoft.

Win 8 or Win 7. Whichever you feel like using.
The bad things you heard were from people too lazy or adverse to change to bother getting used to / customizing a new UI. Windows 8 is a fabulous OS - it's windows 7 with a way better copy manager, task manager, search function, and all while being lighter.

You just have to take a few minutes getting rid of metro apps - don't ever use them or the windows store. Then get used to using the windows button on your keyboard rather than a start button (which is faster anyways) and you're all set.

In addition, if you buy windows 7 OEM (which is now 4 years old), you have a pointless RAM cap on it unless you buy more expensive versions (and no, "ultimate" is not better - you don't need any of the features it has.), and the OS is bound to your motherboard. If you buy windows 8, you can buy the home edition, as there isn't a money-grab limit on your RAM, AND when you build a new computer in the future, you can just de-licence the old computer and transfer the licence to the new one.
 
First, you do not need Windows 7 Ultimate. Home Premium or maybe Professional.

Second...."i heard lot of bad things" is exactly the same things that have been said about every single OS release from Microsoft.

Win 8 or Win 7. Whichever you feel like using.
 
Solution
well not that im gonna bash w8 or nothing but i haad w8 installed on my computer for about 4-5 months its really not a bad os once you get used to it. But i did go back to w7 and actually gained 10 fps in most games i play. So if your using it for gaming i would suggest w7 but it still comes down to personal prefrence