How to fix ESET Nod32 Error communicating with Kernel

Remember my netbook eMachine em350?
Well, a few weeks ago I was using my netbook without problems. But then one day, as I turned my netbook on, a message was displayed, "error communicating with kernel".
The message came from my anti-virus, ESET NOD 32.
From then on, Every time I turn my netbook on, all I can see is the wallpaper, NO Icons, NO Taskbar, NO Start menu, there is nothing. I tried Ctr-Alt-Del, the task Manager shows up, and through that I can open anything.
Please help me.
The last resort would be reformatting my netbook.
I still want to revive everything in any way.
Thanks.
