No way that Roxio creator can slow down your PC! You can check if it indeed running by going into Windows Task Manager! Even if it were running it would not take up 1.67 GB memory, unless you mean 1.67MB which would not slow down your computer unless it is showing high CPU utilisation in task manager. Lastly if you meant 1.67GB disk space then the 1.67GB was probably a CD image or some contents destined for making a CD or DVD. There is no way this program occupies 1.67GB. Even if it did this would not slow down your computer unless you are at the last few GB of disk space!
So if your computer is slow then it is probably due to other reasons. I would start by looking at what is running in Windows Task Manager.
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