plzzz help

guys when i enter the modules in the control panel, and click on "New", the page open but i cant write anything in the box and when i click on the html, the page didn't open... thats on Internet explorer

but on firefox, i can write in the box but the page of the html open in white page, i mean no box or anything to write...

BTW, it was working fine before, but now no, i dont know what happened

if you want screenshot for the pages tell me and thanks in advance for ur help