In response to Mary D
Video Studio uses temporary files to create final movies. Given that you (probably) defragged your disk after the temp files created then the jump problems are likely due to this. Try deleting your temporay files, defrag your disk again and recreate your movie. Hopefully this will help.
Have disabled the screen saver and stopped any processes that I can find, ran defrag, all to no avail.
COMPAQ something or other with 500Gb Boot Disk, 1Tb external Firewire Disk, 4Gb Memory and a super duper sound card, 19" TFT Monitor etc etc etc
Sony TRV33e : Sony TRV310e : Canon XM2
Sony Vegas Studio editions to v11
Remember, there is always more to learn than there is to teach.