I don't record TV programs on my PC so I'm not sure

what the file extension is for such files.

If/when you find out .....just do a search using Windows EXPLORER to locate them.

If the file extension for the TV programs you're recording is "TV2" ..... just do a search using EXPLORER on your C drive for files with extension TV2....or enter *.TV2 in the search window. Once the files are located ...then mark and delete them.

Also make sure you EMPTY the recycle bin too.