Will I Ruin My Life And Other Peoples If I Use My Time Machine?

I have devised a way to travel back in time but not forward ( I am still puzzled on this one). The details of how I have done this is irrelevant but my question is as follows.
If I decide to travel back to a certain date in my past and happen to meet myself or others that have som connection to me will this be detrimental to my current life as I know it?
My plan is to go back and remain undetected by using 21st century technology which is used often by performers such as David Blaine, but on the off chance that I am detected what do you think the best option would be?
You have 3 days and counting to save the future of the planet….or not.

What Are Peoples Favorite Role-paying Video Games?

My favorites from old school are Might and magic 6-9, Wasteland (real old-school but good for its time,) Daggerfall, and Bioware’s versions of the Dungeons and Dragons games.
Recently I have found Mass Effect and Afterlife to also be quite enjoyable.
I have never actually got into Everquest but World of Warcraft was great the only time I got to try it out.
What are your favorites?