My brother's pc is recently hijacked. The error reads:-
Error loading C:\Windows\Downloaded Program Files\bridge.dll.
You should have started by reading the messages at the top of the Security Forum page: UPDATED: DO NOT POST ABOUT BRIDGE.DLL BEFORE READING THIS and Helping yourself: What to do before starting a new thread or posting a HiJackThis log, but we are here to help.
You should read those posts before continuing, as well as updating your copy of HijackThis, which can be updated from within the program. It's easy to to do: click the Config button in the lower-right corner of the program window, then click Update.
You need to run Spybot - Search & Destroy. Make sure that you update the datafiles during installation (be sure you're online). Follow the instructions carefully. Your biggest problem seems to be MyWebSearch, but some other notes follow, as well.
After following the instructions in those two posts and running S-S&D, run the updated HijackThis to see how you are doing. Then, and only then, re-post your cleaned log.
Watch out for the problem denoted in this line:
F2 - REG:system.ini: UserInit=C:\WINDOWS\system32\userinit.exe,C:\Windows\System32\wsaupdater.exe
Remove these (useless):
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\PROGRA~1\Java\J2RE14~1.2\bin\jusched.exe
Get rid of Kazaa. It's one of the worst security risks out there. Find a different, safer network with similar functionality--they do exist.