Downgraded windows 8 couple of problems appeared.

Alright as the title say, i had windows 7 with everything running perfect, until i decided to try windows 8, something i regret, anyway after i downgraded back to win7 i had some weird problems:
1. Chrome work under admin privilege only, sometimes i show error "Check for solution", if run as admin wasn't checked the program wont launch
2. Firefox freeze no matter what i do.
3. IE Doesn't work at all
4. uTorrent stop working after couple of days, just like the chrome problem but it doesn't work with admin privilege
5. Steam act weird, ask for updates "Which i overcome by pressing enter" and when i exit steam and try to log in later on, i have to shut it down from the task manager in the process tab
6. VLC Player stopped working.
And so on, alot of programs which worked perfectly before upgrading is acting weird, so i decided to do a fresh installation, i have "Herrins" CD, i cleaned my HDD and reformatted with a fresh installation of windows 7 still the same problem.
I tried to solve the problems separately some i could "overcome" but not solve other i couldn't, i tried every thing nothing work.

TLDR: Alot of programs wont launch, some launch with admin privilege only after downgrading from windows 8.

Try Cleaning the HD Drive, using Step one in this tutorial:
SSD / HDD : Optimize for Windows Reinstallation

Where did you get Win7 Ultimate? How is it activated?

I had windows 7 copy when i bought my PC, but i lost the CD so i downloaded one with torrent and activated with my old activation key, what difference does it make?

It's rare that Ultimate comes with a PC.

It could have something added if the ISO came from a torrent. Best to use the official Win7 installer for your licensed version from Clean Reinstall - Factory OEM Windows 7

Please run the Diagnostics tool (MGADiag.exe) at this link http://go.microsoft.com/fwlink/?linkid=52012. Click "Continue", click the "Copy" button then “Paste” the report into a reply message in this thread