I'm new here, guys, so don't shoot me down in flames if this has been covered. I've checked the search, but didn't come up with anything the same. I've just re-jigged the Good Lady's PC - it had some sort of virus. Wiped it & re-installed Win 7 Pro. Put back most of the stuff that was there & most everything works except anything that's a '.doc' file. Clicking on any one of those produces a 'Handle is Invalid' error & won't start. However, dragging & dropping on LibreOffice starts up the file & it can be edited. Saving it again does not fix the problem. One noticeable difference is that I have gone from MS Office XP to LibreOffice as the old XP was no longer opening some new file being sent to her (choir!). I am wondering if this may be the cause. I have a copy of MS Office 2010 & will try installing that & taking control of the .doc files. I'll see if that fixes it. Everything else seems to work (at the moment). I've spent the afternoon searching Google for this, but whereas I can find many references to 'Handler is Invalid', none are in this specific context. I'm sure it has a simple cause, & I'm just missing it. Anyone help here?