I recently updated a 5 year old pc with Service pack 3 after the user was complaining of her pc shutting down on its own on irregular intervals and it running VERY slow. I removed her Norton Internet Security suite and installed AVG in its place. After doing a scan, defrag, computer clean, the user complains that her IE shows a blank screen and can't reach the internet. The other computers on the network can reach the internet. Any suggestions?