System drive space doubled in size within the past month.  

Thanks for the replies.....I have one more question....I didn't see where this is a 32 byte or 64 byte .exe so would I be storing this folder under program files or program files (x86).

The WinXSX cleanup reduced the size by 3.5Gb, but it's still about 5-6Gb larger that it was in January. This issue cropped up when Macrium slowed down, but didn't know why. Now, I am aware of this issue from the numerous posts about the subject here and elsewhere and will post separately.

Thanks to everyone for the cleaning suggestions. Additional cleaning of WinSxS and the Update files stored in their Download folder reduced the original 42Gb to 36Gb.