Yep, tricky one this, now I`m no puter expert but a couple things come to mind. Firstly I find with Avast more recently they prompt me very regularly to check my updates for java etc, then tell me my pc is not running to its best performance, can they check it blah blah, no they cant. Its just bloatware. In fact I`m getting fed up with Avast myself. If it was my problem I would be inclined to turn off avast or even uninstall, and then run a free AVG in boot time and see what difference that makes. As for PUP`s coming in via MBytes I would be astonished. Yesterday Avast updated the virus programme twice. After the second update it stated my pc was running very slow which it is not. So, terminate advice then to be confronted with an Avast full page suggesting they can sort the problem for a price. Very tedious.