A brand new version will always have issues.I find it better to wait after an bugfix update before installing an entirely new upgrade and this applies to most software.
Tried updating from 8.0.1497 as part of routine maintenance today in XP SP3 Pro and my system shutdown and start-up times became horribly slow. On restart Avast doesn't even load in the tray nor did a couple of other things. Fortunately a system restore to two days ago appears (touch wood) to have fixed my machine. THIS AVAST 9 IS NOT READY FOR PRIME TIME sadly. Not crazy about the new GUI either. At last for me it's LESS intuitive...
Until I can replace this laptop with a new one running Win7 Pro or Ultimate, let me know when Avast 9 is fixed for XP!
Is Avast going to fix this disaster, or just ignore XP and for that matter, Win7? I've had Avast since 5 and updated to 6, 7, and 8 without issue. The GUI was usually improved each time and easier to navigate. With 9 while I had it, that was ANYTHING but the case. I've recommended Avast to countless people too! Are they NUTS with this release?! "One size fits all" just ain't working.
VERY disappointed...
AND..., BTW..., after doing a system restore and many reboots, the box is now working normally after starting, but shutdown has lengthened to 21 - 28 seconds from what WAS 5 - 7. Took two hours and missing an important dinner to get back up and running on Avast 8.
Whoever designed Avast 9 must have worked in DC... ;-(, or is only interested in clients on Win8. Business will be on 7.1 until well into 2019. WHAT were they thinking???!!!
Sorry for the rant, but unless there is a radical fix, I'm going to need to find another AV solution for the Haswell machine I have to buy before the end of the year. VERY disappointed...