Today my pc didn't start up. I use win 7 with hazard loader. So I did a repair as described in this forum. It started up again but I became victim of illegal software. (black screen) So I removed hazard loader and installed last Daz loader. Now everything seems to be ok again. I can do a windows 7 upgrade again! But I'm 100 % sure I didn't install KB971033 . I looked for it every day several times and never found it! So what happened?