Windows won't upgrade properly

  TOFF 20:06 14 Dec 2012
Locked

I installed W8 successfully about a month ago and all went well. The only recent change I have made is to install Startmenu8 to get a more normal Windows look. Last weekend my computer screen went dark blue and the mouse seemed not to function. I changed batteries and rebooted. However all I got was my desktop with no task bar and no icons. The programmes showed up along the bottom but would not open maximised so I couldn't use them. I have run the diagnostics on F12 at start up. All was ok according to that. I wanted to restore to a previous point so I managed to boot from my CD drive with the recovery disk (W8 version) but it said that both my restore point and image wouldn't work. I therefore tried to do a clean install of W8 but that wouldn't work. It just hung after several hours. I tried the same with W7 but with the same result. My machine came with Vista so I installed that from the Dell recovery disk. This worked. I then tried to upgrade to W7 SP1 (an upgrade which would never install back in the day) from a CD I downloaded off the Windows website. That went on all night with the machine interminably rebooting. Still hung this morning. So I reinstalled Vista as above (clean) and tried to install W7 from the original upgrade CD. This hung also. The reason I haven't gone straight to W8 is that I think I have an image from a few months ago before I upgraded to 8. I've just started restoring from a reasonably W7 image in Vista. Cross fingers but it seems to be working. However, I wanted to do a clean install and wonder why neither W7 nor 8 would complete. Any ideas?

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