Default [Q] Cannot enter SSL via wifi

I cannot get onto websites that are SSL (black padlock appears)
seem sites that are secure will not let me enter with my galaxy y (GT-S5360)
It as been unlocked and was working fine for last 3 months but i must have changed something in settings and when i try to enter banks etc..a black padlock logo appears and it does not go any further.
I am linked via wifi to my home router.

Any help appreciated.