You can't import vcd or dvd types directly of the disc into Hoster.
If you open a vcd disc in explorer they usually files with a .dat extension, you have to copy these .dat files to your hard drive then they can be imported under the video option at the bottom of the Import hard drive files dialog use the little drop down arrow and select all types or dat & vob files.
Now DVD is another problem, you can't just copy files of a DVD, you need another software to rip the files to your hard drive first these files will have a .vob extension. once ripped to the hard drive you can import them the same as the vcd's.
There are many DVD ripping softwares available, there may be some free ones but a lot of them wont rip protected DVDs which most commercial DVD'S have.
I use "ImTOO DVD Ripper " and I select the to MP4 format.
This is a link to the site:
http://www.imtoo.com/dvd-ripper.html
You can probable sample it for free for a limited period.
DVD video files can be quite big compared to CDG type files so you will need plenty of spare Hard drive space.