I installed 8 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. Yesterday my computer screen went dark blue and the mouse seemed not to function. I changed batteries and rebooted. However all I get is my desktop with no task bar and no icons. The programmes show up along the bottom but will not open maximised so I can't use them. I have a Dell desktop and have run the diagnostics on F12 at start up. All is ok according to that. I want to restore to a previous point but cannot get at Windows to do this. Any suggestions gratefully received.