Sometimes and lately frequently, After system desktop and tray icons
are loaded successfuly, the computer freezes (Acer Aspire 3004WLCI)
and after that freeze i cannot launch apps like IE6,7, MSN 7.5, WLM8
etc also control panel.

Doing ctrl-alt-del does not help, the cpu usage is %0 or 1,
terminating some exe files does not help.

The only thing i can do is pressing power button more than 4 seconds
to close computer via emergency shutdown.

I couldn't find out. This problem will drive me crazy!!! I tried
plenty configuration of services(i set some services 'automatic' which
are started although they are set to 'manual')

I simplified progams via add-remove.

I run updated version of McAfee8 and found no viruses.

My hijackThis report is this also:http://onurgu01.bravehost.com/
hijackthis.log

Any useful help is appreciated.

Thank you...