I am working on a Dell Inspiron 660 desktop with Intel core i3-2130 CPU @3.40GHz with Windows 7 Home Premium 32bit.
I was having issues installing a TurboTax update and it seemed to be a windows installer problem, however it succeeded on 4 out of 5 updates. I then tried to install windows updates and all 35 failed.
The TurboTax update gave me a Microsoft error code 1648 and I researched it and attempted every solution they gave such as
sfc /scannow, and
chkdsk /r none of them worked. Due to so many fails, I decided to do a completely fresh install of Windows and I now have 145 updates that are also failing.