try lifting your sliding door as you open it,if it moves ok its one of your rollers,prob the one furthest away from your lock,if you look down the edge you should see a small round plastic cap,pop this off and you will be left with a small 10mmish hole,inside is a screw,if you turn it clockwise it should lift your door,keep turning untill door is level and should be ok.hope this helps
shaun www.sdwupvcrepair.co.uk
November 2008