Win Vista Home Preminm Serv Pak 1 won’t install properly

I have run the virus and adware scans previously and it was clean system. Now when I run the install it gets to the installing 3 of 3 100% and then reboots going back to the installing 3 of 3 and look like it will work but then loops on the 3 of 3 screen. I have restored to a previous point to the serv pak install and tried the install again but it does the same procedure all over. Any Ideas .. this is a dell inspiron 1420

I believe it is the
C:\Windows\Software Distribution\Downloads folder. Don’t delete the folder just the contents. Also it is best to stop the updater service if doing that.
Although manually downloading and installing that file instead of the windows updater should have solved that. But you never know.
The code on the bluescreen will probably help to figure out why.