My Traffic X is not launching...

I installed MyTraffic X on my PC with FSX. IT ran fine for a few days. Suddenly some days later, the My Traffic X was not launching for some reason. I even unistalled FSX and My Traffic X and still doesnt show that it's working - no additional planes.

Not sure what to do...

This is how to get rid of the default traffic, see if there is a change in yours from the add on traffic.

Go to Program Files\Microsoft Games\Microsoft Flight Simulator X\Scenery\World\Scenery\ and rename the file "trafficAircraft.bgl" to "trafficAircraft.bak". If you want to enable it again, just change the file extension from .bak to bgl.
You can do the same for the traffic in the water by renaming trafficBoats.bgl to trafficBoats.bak

can u fly the aircraft in my traffic

No, you can't.