Irfanview can read (and write) pdf-files with the right plugin.
Since you don't tell what edits you want to do, nor why you can't, it's impossible to help.
As mentioned here, I am trying to use Irfan View and Gostscript to open a pdf. Apparently, it should just work but it does not work in my case. I went through IrfanView forums with no avail and the forum is so moderated that you can not post right away after new registration, kind of irritated me but anyways, wonder if anyone knows how it can be done.
I am using IrfanView 4.33 and have 32 as well as 64-bit ghostscript installed. The OS is windows 7 64-bit Home Premium, updated till date.
Thanks in advance.