Pulling from tapes not going to sound to great to begin with, but if you're using a portable tape player make sure you set the volume to around 80% of max. Too high and you'll be clipping, too low and all you'll get is static.
Check the sound level for your mic input as well. Same logic applies.
Don't know about the Creative software, but most CD burning suites have built-in apps for analog audio extraction with hiss and pop filters.
I've used Nero, works pretty good. http://www.nero.com