How do i copy and paste video files from my PC to the Samsung A5146 player

Firstly, if your player is strictly an MP3 player, it will not play videos. MP3 is a music file format. The generic/umbrella term for video files is MP4 (MP4 is just one video format, but is not the only one).
To download files from your PC to your player, hook up the player to a USB port on your PC using the USB cable that came with the player. Once connected , the player will show up in Windows file explorer as a removable drive. Copy and paste the files you want to download on that removable drive using Windows file explorer or Windows Media Player or iTunes
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plug samsung to PC......open two windows, first go to start my computer open c drive find the folder with the music........ now go to start again , my computer open the Samsung music (where mp3 will be stored) file......... now click/drag or copy/paste from PC to device

Deleting Files,Pictures,Videos,Audio Books, etc. from MP3 Player
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Hook up your mp3 player to your computer
Go to your desktop and double left click on "My Computer"
When it opens you will see listing that says "Devices with Removal
Storage" your mp3 player should be listed there.
Right click on your mp3 player, and a window will open, right click on
"Open" and now your files/songs should be visible.
Hold the left click down and drag it across all the files/songs that
you do not want this will highlight the files/songs you do not want,
release, right click and then click on "Delete"
Now your mp3 player should be clear of the files/songs you do not want.
Be careful and do not delete files needed to operate your MP3 player.
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connect your player to the PC. open the 'My computer' window and open the player to display all the files present inside the player. Now you will have to decide which files have to be delected. check one by one, right click and selcct delete to confirm deletion.
Repeat and rearrange all your files. Now enjoy your favourite songs. Good day

The videos will only work if their the size of the screen. The player should come with the video shrinker?

Dear! You should install total video converter on your PC and then you should convert your files in correct format. Then you can past in mp3 it will work 100% guaranteed.
Thank You

plug the usb cable from pc to your player then download your mp3 file. you can use copy and paste also. copy the file from pc and paste to your player.

copy paste

First you need to plug it in to the USB port, if you are running anything newer than windows 98 you won't need a driver. Double click on my computer and it shows up as a removable disc(usually drive letter f:), double click this drive to open it as folder. This folder will show you all directory's and files on your player, here you can delete any songs on your player by finding the file and deleteing it. From here you can also put your music onto the player by copying and pasting your music files from your hard drive. If you are not sure where your music is located you can run a search by clicking START>SEARCH>FOR FILES OR FOLDERS (if you are running XP click pictures music or video, check music then click search, each file will have it's location in small print below it's name, or you can right click each song and hit copy, then go back to f: drive and right click and hit paste, you can copy more than one). Hope this helps.

http://org.downloadcenter.samsung.com/downloadfile/ContentsFile.aspx?CDSite=uk&CttFileID=251270&CDCttType=SW&ModelType=N&ModelName=YH-925GS&VPath=SW/200502/20050221082954906_Samsung_Music_Studio.zip