Hi ciliegia,
If they are personal videos and you just want to copy them to your PC, Open Windows File Explorer and simply drag the Video TS folder from the DVD into a new folder on your PC (no need to bring the Audio TS folder over - it is empty!
If you want to convert the DVD to a video format, use something like Format Factory, which will rip the DVD's onto your hard drive in MP4, AVI . . . etc. format