Windows 10: Installation problem

I have Dell Inspiron 3000 version came with Windows 10 pro , I downgraded it to Windows 7 . but now want to upgrade to 10 pro .. due to some issues my HDD is fully erased and I can't install now , showing that system image is missing what to do ........ please ... suggest.... solutions for this..

:)

 

application insalltion failed

i am using n72 and
everytime when i try to
install application it shows
file currpted.... like this ,,and
other problem is when i
restore my nokia, its not
restore properly, nokia default
themes should be appeare,,
but it show another themes
which i had installed before ....,,is
there iny problem with
the mobile internal files because
i used to file explorer
to remove some ...unnecessary
file,,, please suggest me
which file is missing and
how it will work correctly......or
i have to visit nokia
care near my residence....

 

BlueTooth Problem and Installation Problem

the codes are *#7780# for resetting and *#7370# for formatting. make sore you backup your phone so as not to data. but to my surprise the problem resurface yesterday.

 

Download the Windows 10 ISO file:
Windows 10 ISO Download - Windows 10 Forums

Burn a DVD from the ISO image or create a Windows 10 USB flash drive:
USB Flash Drive - Create to Install Windows 10 - Windows 10 Forums

Boot from the DVD or USB flash drive and clean install Windows 10:
Windows 10 - Clean Install - Windows 10 Forums