Not good news.
I too ran the decomcnfg on my new HP with OEM Win 8 and got the same results that you did, blanks. Then I ran it on an older HP upgraded from Win 7 with Win 8 Pro. Same - blank.
I then ran some regedit clean up tools and my computer did speed up. *( It had become sluggish the past few days ).
Then I ran Spybot, search and destroy. Took about 2 hours. It found 42 issues and cleaned them.
In two instances running the cleanup software completely locked up my computer. But Spybot ran OK the second try. Win 8 just is not friendly at all to others.
Tried decomcnfg again and nothing was cured, still blanks.
Unfortunately there doesn't seem to be any available fix in Win 8 for blank dialog boxes that I can find. *( But looks to me like the regsvr32 Jscript.dll is worrisome. I don't like the 32. It was suggested to delete it but I won't recommend that. )
I've found 5 defects in Win 8 so far and this one is beginning to look like #6. For a WAN system Win 8 wouldn't recognize the NAS server computer and there wasn't any fix. The IT techies made a workaround themselves that entailed going into the registry manually and doing it.
It still appears that you still have corrupted or missing files. But that doesn't seem to be the problem for curing blank boxes.
You have one thorny problem alright.