Big cpu usage after reinstall of OS

Hello, a day ago i reinstalled my OS (win 7 x64 ultimate).
After that i launched my favourite game (lineage 2) and when i logged in game i experienced some freezes and lags, so i looked to task manager and i saw that l2.exe process eats like 40% of cpu per on window, my cpu isnt strong, but before reinstall it ate like 8% of cpu.
So the questions are: Whats causing that game started to eat like 5x more cpu then before reinstall?
Any idea which drivers i might be missing?
I thought it can be caused by some drivers which might be installed with some other games in past.
AMD Athlon 64 X2 5400+ Black Edition
Gigabyte GA-MA770-UD3 (rev. 1.0)
Gigabyte ATI Radeon HD 4670 512MB DDR3 GV-R467D3-512I
I have newest catalyst installed and also i have amd dual core optimizer.
Thank you for your answers, George :hello:
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  1. Are you sure your cpu was only at 8% before when playing the game? What other cpu intensive processes are running while playing the game?
  2. Yes, I'm absolutely sure.
    Here is print screen from task manager, I'm almost constantly running these processes with the game.
    Thank you for your answer, George
    //edit Also I'm sure that svchost.exe was there only once before reinstall and wasn't eating that much memory.
  3. How about your motherboard drivers? Chipset, LAN, Audio.
  4. I have installed chipset drivers from gigabyte site.
    For audio i have realtek HD audio.
    And for LAN drivers i don't remember that i installed something, do you think that this might be the problem?
  5. Ok,
    i reinstalled chipset audio and lan drivers, reinstalled game, defragmented disc and game is still eating much cpu :(
  6. UP, any advices?
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