Where is the delay when opening a video file?

Question

Windows

Faced with the fact that on a freshly assembled PC under Win8.1, media files open with a significant delay (2-3 seconds).
Installed:
- The delay does not depend on the container\codec of the opened file (mp4, wmv, avi, flv).
- The delay is practically independent of the size of the file being opened.
- The delay is not related to the launch of the media player program, because It also appears when switching to the next file in the playlist of an already running player.
- The delay is not related to a specific media player - it appears in KMPLayer, and in DAUM PotPlayer, and in GOM Player, and in VLC player.
- Latency is not caused by weak hardware:
-- CPU\GPU is more powerful than on my other computers, where such problems are not observed
-- the disk subsystem is faster (SSD versus HDD), moreover, the same brakes from another disk (via SATA) (while on other computers there is no such delay even when opening media files from slow flash drives / external HDD).
UPD
- Antivirus does not affect - turned it off, the result is the same. Antivirus for the test was disabled completely. Moreover, on other PCs it is the same, there are no such problems (although there is Win7).
- On other PCs, the same files are played normally; the players are the same, and there are no such problems on other computers with any of them.
I never installed codec packs, there were always enough "built-in" ones in PotPlayer\KMPLayer.
When viewing a large number of short files, these 2-3-4 seconds of delay with each switch are very annoying. Where to dig?
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UPD
The answer, marked with the solution, contains this very solution in the comments.
It describes how they got to the bottom of the truth. In short:

Installed firewood from the nvidia site, the problem disappeared. Thanks again.

Answer 1

Antivirus installed? The same files on other machines by the same players are normally lost?