Chrissie, as I mentioned before all these old AVG files are not causing you trouble. They are safely tucked away and are not a threat.
Although there are two hundred of them, and you are worried about that, they are ywo hundred very, very small files......only a few kbs each..which are not taking up any great space and are not slowing down your PC.
Forget they are there and ignore them.
As to the file YSIGNU~1.EXE , it is legitimate. It is part of the other file that that you queried before ( AVGINSTALLEDAPPX.EXE ) . Here is the official word from AVG.., and I quote from the AVG forum at
http://www.avgforums.com/viewtopic.php?f=4&t=1448quote "Hello,
The AVGINSTALLEDAPPX.EXE file is an official file from AVG Technologies. Please allow AVGINSTALLEDAPPX.EXE to pass though the firewall, it is a part of our Cloud technology for Product Improvement Program. If you have any other questions please contact us by
http://www.avg.com/supportArthur M.
Business Support Specialist
AAS, Information Systems Security
AVG Technologies USA, Inc.
Education, Government Sales and Support
2105 Northwest Blvd.
Newton, NC 28658
828-459-5422 " .....................unquote.
So that is a legit file and should be ignored. It is still showing up as a registry item on your PC...but it will not do any harm. Forget it.
As to your slow and sluggish machine.
Was it like that before you made the avg-to-avast switch ?
If not, it is something to do with Avast........nothing to do with "infections" ( you do not have any infections....avast, malwarebytes and Trend housecall all give you as clean ).
I suspect it is the "Behaviour Shield" in Avast. When first installed, this part of Avast tracks and learns your every move and learns your behaviour patterns on the basis that if anything then happens that is not within your behaviour pattern...it will question it and flag it as unusual.
It would be worth turning off that part of Avast to see if that is what is slowing you down.
To do that, open Avast GUI, on the left hand side click on "real time shields" then click on "behaviour shield" and when that happens click on the stop button and then apply/ok out of that. (The systray icon will change at this point and tell you that you are unprotected...ignore that for the moment until we see if this shield is the problem. We will rectify that in a moment )
One other thing about the slow PC.............can you let us know how much RAM is istalled, can you also post a screeny of the "processes" tab in taskmanager (expand that window to show all processes ) .............that will show us what is running on your PC and may throw up something that is slowing you down.