"ISOLINUX 3.63 2008-04-10 isolinux: image checksum error, sorry"
Can you post your iso?
I had this too and i saw that you downloaded the first generic retail and this one boots.
My solution is to download the first generic retail, cause this one boots without the checksum error right?
Well then download the latest iso version which Jummy told me, just a few posts above here.
then open the image in windows with ultraiso, get the initrd.img.
You should notice that every file and dir is in uppercase.
copy the INITRD.IMG to the desktop.
Then rename the file to lowercase initrd.img.
Open the first retail which boots with ultraiso, you should notice the lowercase, isn't?
Now copy the initrd.img (lowercase) from the desktop to that image, it should ask overwrite? answer yes!
Then simply save and burn, that image! And it should work out of the box.
If this wont work, I will upload the iso which worked for me for you.