Hi Tintu, and welcome to TViXiE forum!
1. If your movies are all stored on the TViX HDD, you only need to have the PC turned on when you are creating the images for your TViX movies. The image files are stored in the actual movie folders, so you will have the same effect whether the PC is on or off, or even if you disconnect it totally and take it to a friend's house
2 The jukebox features were introduced in v1.5 of the 6500 FW. Basically, instead of ending up with a list of files in a folder, TViX converts the movie file to 3 buttons which makes the whole GUI look neater.
See the screencaps in the guide