Phone [Q] default lancher not setting up


I am using HTC desire X,(unrooted)
I usually change launchers, was using ss launcher for quite long time, since a week there is a problem with the system,
Its repeatedly asking for deafult launcher to be set. Shows pop up when i press home screen( Complete action using- HTC sense or SS launcher)
Even if i select always option"" it again pop ups after few time.
This problem is not only for ss launcher, i have tried deactivating ss launcher and installed other lau"nchers and tried, yet the same pop up appears
Not able to use any laaunchers..

Plz help for a solution with out resetting the device......