Hello, I am new to this. I have a windows 7 home addition that I am trying to fix. It automatically shuts down and I can very rarely get it to go into safemode. When it trys to start up in normal mode it tells me there is an error explorer.exe and gives a code with a bunch of zeros and a 22 at the end. I do not have a back up cd. My question is is there a windows 7 os backup or free registary fix that I do not have to buy to try and fix this?