Thanks for responding, well everytime i begin speeding up the runway the airplane(all of them) seems to go extreme left or right. this just started to happen recently, however i did
install Xenviro and XPRealstic Pro, at the same time. could this be related?
UPDATE: I Just solved the problem, apparently it was Xenviro Settings For Surface Winds- it was set at 50mph at surface level, hence i changed it to 0 and I am back on a straight line again :)).