update to 4.3 now in recovery mode help?

I was trying to update my iphone to version 4.3 through itunes when it apparently from what i understand put me in the recovery mode. I have tried uninstalling and installing itunes and relevant things that go with it but to no avail. Getting rather fed up now can anyone give me any ideas? During the installation process it did say that ApplySync Notifier could not be installed this maybe the problem but dont know where to look for it to install it?