Connected no problem this morning, Avast 4.7 virus update installed itself, I looked at the online newspapers, switched off and had a late breakfast.
Impossible to reconnect to the Internet. Scanned with Trojan Remover which told me that sens.dll was locked. Went to look at sens.dll and Avast told me it was a trojan.
Turned off Avast, looked at sens.dll with Trojan Remover = no problem.
With Avast still turned off, connected OK on the internet.
Checked with Kasperski on-line scanner = no problem.
sens.dll is part of the files which are needed for going online.
Wasted an hour, thank you Avast.
With the evening I wasted last week because of the useless 4.8 which froze my PC until I uninstalled it [it seems that only Avast's people can use 4.8], I have had enough.
I don't want to go into futile discussions about which soundcard / drive / hardware I have, about defragmenting my drive, about uninstalling this and/or that, about doing a restore etc... My PC worked no problem until 4.08 came and went, and until this morning's upgrade.
Avast will be uninstalled in a few minutes, never to return.
Martin.
Thoroughly fed up, who used Avast for many years.