Xperia Mini/pro :: Can't Establish A Reliable Data Connection

i bought the xperia mini pro a couple of days ago...i have been impressed with its features and functions and it really looks a real deal....i havent been disappointed by any of its feature...but today when i tried to acces andriod market i am unable to create a new google account therefore cant go through andriod market.as it says "can,t establish a reliable data connection....."i have been searching tirelessly on internet on this issue and have found that it is very common one....so i tried the following things but it didnt come up with the required result 1.i checked the "background data raffic" in accounts and sync.2.i tried to reset my phone wihout the sim card but nothing helped....now i cant try that Internet account trick as "Internet" is banned in my country due to some religious issues...the thing left to do is a "hard reset" i havent done that in any of my phones but i think i have to do it now...fortunately there is almost nothing that i have saved in this phone...i did take a couple of photos today but its not that important.....is it worth to "hard reset" my phone? as i havent done it ever since...would it be safe to do and not remove my stuff saved in my memory card?..as i dont want to lose my music and other stuff saved in the memory card....