ehemanan awlak nehe....
com eka restart karala beluwada....
samaharawita virus walin ohoma wenawa...i have that experience...
better check for viruses....
anyway...periodically...delete internet browser cache and cookies and history...
it'll help a lot to get rid of virus attacks related with the browser...
and sometimes your settings may be wrong...it happens...check proxy settings...set it to no proxy if it is changed...