Hi martalaura,
Welcome to the Sony Community!
From what I understand from your post, the imported videos are not showing up PlayMemories Home when you try to open them. If you recently upgraded your computer's OS to Windows 10, then I suggest uninstalling PlayMemories Home from your computer and reinstalling it again. This will initialize the connection and you will then be able to import and view the files in PMH again.
NOTE: All the videos and pictures uploaded using the previous version will also be managed by PMH once you've reinstalled it.
Answered your question? Glad I could help! Please Click the "Accept as Solution" button below. Thanks_Mitch