autoruns reports missing files

I have another thread open for another missing file reported by autruns, but it also lists these 4 files as missing:

Autorun entry: VIDC.l420 Image Path: File not found: emYUV.dll
Autorun entry: VIDC.YUY2 Image Path: File not found: emYUV.dll
Autorun entry: VIDC.VP80 Image Path: File not found: vp8vfw.dll
Autorun entry: vidc.XVID Image Path: File not found: xvidvfw.dll

I'm guessing these are all codec files? Autoruns don't list a file location for these but selecting "jump to entry" opens the listing in the registry. I don't know If I should just delete these missing entries in autoruns or leave it alone or should I worry? I've been setting up my new 64-bit PC and I've been installing and uninstalling various software getting everything set up. I'm guessing these files got installed and removed along the way, but I'm wondering if these missing files will cause me any issues?

Yes they are Microsoft Codecs. A repair install is in order.

Also keep everything together in one post if they are along the same lines.

I checked my old Windows 7 PC for the heck of it and one of the 4 missing files I listed above is on my old PC - emYUV.dll. Hovering over the file on my Windows 7 PC reveals it is "Empia YUV Codec" from Microsoft.

Since I've been installing/uninstalling various software on my new Windows 10 PC, couldn't these 4 missing .dll codec files have come from one or more pieces of software, and when I uninstalled them they just left those behind? Are these files supposed to be in the system32/sysWOW64 folders by default with a fresh installation of Windows, or are they placed there as needed by media software? Do other people here have these files on their PC? Can somebody check? I did install and then uninstall a couple pieces of media software that may have installed some codecs as it needed. I don't want to go through all the trouble of a repair install just to find out that these 4 files don't even get restored because it was another piece of software that installed them. That would be a lot or trouble and risk for nothing.

Keep in mind I don't use codec packs. But as I said a couple pieces of media software (converters, etc.) may have installed/uninstalled codecs as it saw fit. So these 4 missing codec files may or may not be needed any longer. It seems rather drastic to do a repair install if I don't even know that these 4 files would get restored. My PC is running fine. I'm just worried about these 4 "mising" files.

bro67 said:

If you did a rollup install from 7 to 10 on that machine, there are going to be items left over that do not get removed during the upgrade process. A Clean Install is in order after you upgrade to get the 10 license. You will find that problems will go away if you start with a clean slate.

I did a clean install, not upgrade. Brand new PC I built myself. Clean WIndows 10 install from a retail install USB thumb drive.

I'm still thinking these 4 files are leftovers from some media software I installed and then uninstalled along the way over the past few weeks getting my PC set up. Can anyone verify if these files are included by default with Windows 10? Does everyone else have these 4 files? If not, then I can assume they're not originally part of Windows and doesn't warrant a repair install for no reason.

I ran Hijackthis. There's a whole bunch of things listed, including a whole bunch of "missing files" that aren't missing. But none of those files are the 4 files I listed in this thread.

Which leads me back to : What do I do about these 4 missing files? Are they needed? Do they come with Windows? I don't want to do a repair installation for no reason if it isn't even going to install these files because they came as part of a program I have already uninstalled. I don't know if I should uncheck these entries in autoruns, delete them, or what? If they are important and needed I'd like to know what to do about it. My guess is the entries are left behind from a piece of software that came with it's own .dll codecs and uninstalling it left the entries behind. Autoruns does not list the location of these 4 missing files. They aren't specifically listed as belonging in my system32/sysWOW64 folder, so they could just as easily have been in my program files folder for the software that installed them originally. I noticed a couple media converter/player programs I tried out installed their own batch of codecs to their program folders, so that may have happened here - they got uninstalled from the program folders and left the entries behind for autoruns to see. I'm just guessing here - that's why I"m asking for guidance.