Extremely hard to get rid of once that happens. I scoured the web for any possible remedy for the Google hijack virus but usually ended up reinstalling Windows. When it started happening too frequently I gave up windows altogether and moved to Ubuntu-Linux(free).. and have never looked back since. Linux (and Mac) are rock solid and virus proof.
A workaround is to disable javascript in your browser. (Edit—>preferences->.... )
“Linux (and Mac) are rock solid and virus proof.”
They’re virus proof?