Brief review.
I had to install my Windows 7 Home again on this Dell 755 desktop. After it was installed, I got lots of updates, about 190 or more.
Now yesterday I go a message that I need SP1. I did not have SP-1 then. I started to update to SP-1, but was it did not work. So I think.
Now today, after reading Patio's remark, I checked again and it says I have it.
Oh well, If it works, I am OK.