I found the entry for MarkForDelete on the UESP Wiki.
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Deletes the targeted object the next time the area (cell) it resides in is reloaded. Useful for removing specific unwanted furniture/decoration from homes. Be careful as there's no way to restore deleted objects. Objects marked for delete will show [D] next to their ref ID if you re-target (re-click) them. Can be used to remove Ash Piles and Ghost Remains, which otherwise never get removed from the world.
But I really doubt this is the cause of your CTDs Lopov.
QUOTE(mALX @ Jan 9 2015, 08:15 PM)

My game never stuttered even once until I installed the Official Texture Packs. Since then it stutters a lot, and I have many more CTD's too.
I am not surprised. The high res texture packs require a lot more RAM to use, and so will tax your computer. If you do not have a lot of RAM to begin with, that is a big problem. I have the high res texture packs and Skyrim typically uses about 2 gb of RAM on my computer.
This post has been edited by SubRosa: Jan 10 2015, 03:23 AM