I thought you'd probably say that. It means WSH can't be reinstalled as it is part of IE - unless you take IE off and put it on again.
Try pulling up a command prompt and entering this lot one at a time, pressing enter after each:
cd c:\windows\system32
regsvr32 dispex.dll
regsvr32 jscript.dll
regsvr32 scrobj.dll
regsvr32 scrrun.dll
regsvr32 vbscript.dll
regsvr32 wshcon.dll
regsvr32 wshext.dll
regsvr32 wshom.ocx
When you get here, reboot and try setup again