Press <menuchoice><guimenuitem>Start</guimenuitem><guimenuitem>All Programs</guimenuitem><guisubmenu>Accessories</guisubmenu><guimenuitem>Command Prompt</guimenuitem></menuchoice>. Type <emphasis>cmd.exe</emphasis> into the box labelled <guilabel>Open:</guilabel> and press <guibutton>OK</guibutton>.
You left most of the original strin intact:
Press <menuchoice> <guimenuitem> Start</ guimenuitem> <guimenuitem> All Programs< /guimenuitem> <guisubmenu> Accessories< /guisubmenu> <guimenuitem> Command Prompt< /guimenuitem> </menuchoice> . Type <emphasis> cmd.exe< /emphasis> into the box labelled <guilabel> Open:</ guilabel> and press <guibutton> OK</guibutton> .
to:
Press <menuchoice> <guimenuitem> Start</ guimenuitem> <guimenuitem> All Programs< /guimenuitem> <guisubmenu> Accessories< /guisubmenu> <guimenuitem> Command Prompt< /guimenuitem> </menuchoice> .