Missing explorer.exe (??)

Acer Aspire 5734z Win 7

Long story, short (as possible).  I have been dealing with BSOD and have removed the malware BUT, I still don't have an operable screen. The registry Winlogin shell states explorer.exe but, upon reviewing the Windows folder , I have noticed that I no longer have a stand alone explorer.exe file (if there was one to begin with).  I suspect what happened was the malware removed it.  Anyway, I am obviously needing to get a hold of another explorer.exe file to put back into the folder, so how should one go about doing that - using any old exe file from another Acer??  I don't want to attempt a factory default, just yet!

Any help appreciated. TIA.

Thanks for the quick reply Djembe. 

The OS was preinstalled on the laptop and btmk, it didn't come with b/u discs.  I'm just getting soo frustrated at this and banging my head against the wall!!

Saugen, thanks for the reply.

I tend to store my vital files on an external drive and don't really keep much on the HD other than applications programs or files which I'm prepared to sacrifice per se.  Obviously hoping there is a "quick" way to resolve the BSOD and avoiding going back to factory settings; but, I think this evening, I shall bite the bullet and do just that and spend the time reinstalling my software.  Its only time - and thank goodness for Scotch!!
 

... I've found the best solution for any computer problem usually is locating RoyalLochNager.drm or Bunnahabhain.drm and downloading it straight to your system....

Well, I wouldn't go as far to mention emergency, nor casualty, for that matter. But, it certainly made things more enjoyable....

... Well, things got abit more rogered (by my admitted stupidity) and no desktop in safe mode, so going to factory settings, was going to do that a couple of evenings ago but other things got in the way so going to start after lunch.  Don't mind, clean slate in the end. Or, I'm going shopping later on - not for more scotch, tho!