Problem with my n gage installer

[Jheeta]

Hey guys, i got a prob with my fone, everytime i wanna install something on it it comes up with an error saying application is already installed, but i aint installed it. I transfer the files using an mmc reader and use filexplorer to install them, they are Sis format, so it opens with app manager, but i cant seem to install anything, pls help

[tzeonn]

try, placing the .sis file on the root of mmc, not in any folders, then go to manager and install from there.

only works for ngage.

[Jheeta]

thats wat iv been doing, still not working, i tried installing other software which are sis format they work fine, im thinking of formating my phone, do you think that will help?