Corrupted System Files? Can't copy and paste and more.

[xilolee]

Export your [HKEY_CLASSES_ROOT\Folder] (from regedit, the windows registry editor) and compare it with this (mine: I left 7-zip and mbam, I removed windefender and gridinsoft antimalware):

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Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\Folder]
@="Folder"
"ContentViewModeForBrowse"="prop:~System.ItemNameDisplay;~System.LayoutPattern.PlaceHolder;~System.LayoutPattern.PlaceHolder;~System.LayoutPattern.PlaceHolder;System.DateModified"
"ContentViewModeForSearch"="prop:~System.ItemNameDisplay;System.DateModified;~System.ItemFolderPathDisplay"
"ContentViewModeLayoutPatternForBrowse"="delta"
"ContentViewModeLayoutPatternForSearch"="alpha"
"EditFlags"=hex:d2,03,00,00
"FullDetails"="prop:System.PropGroup.Description;System.ItemNameDisplay;System.ItemTypeText;System.Size;System.HomeGroupSharingStatus"
"NoRecentDocs"=""
"ThumbnailCutoff"=dword:00000000
"TileInfo"="prop:System.Title;System.HomeGroupSharingStatus"

[HKEY_CLASSES_ROOT\Folder\DefaultIcon]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
  00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,68,00,\
  65,00,6c,00,6c,00,33,00,32,00,2e,00,64,00,6c,00,6c,00,2c,00,33,00,00,00

[HKEY_CLASSES_ROOT\Folder\shell]

[HKEY_CLASSES_ROOT\Folder\shell\explore]
"LaunchExplorerFlags"=dword:00000018
"MultiSelectModel"="Document"
"ProgrammaticAccessOnly"=""

[HKEY_CLASSES_ROOT\Folder\shell\explore\command]
"DelegateExecute"="{11dbb47c-a525-400b-9e80-a54615a090c0}"

[HKEY_CLASSES_ROOT\Folder\shell\open]
"MultiSelectModel"="Document"

[HKEY_CLASSES_ROOT\Folder\shell\open\command]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
  00,5c,00,45,00,78,00,70,00,6c,00,6f,00,72,00,65,00,72,00,2e,00,65,00,78,00,\
  65,00,00,00
"DelegateExecute"="{11dbb47c-a525-400b-9e80-a54615a090c0}"

[HKEY_CLASSES_ROOT\Folder\shell\opennewprocess]
"ExplorerHost"="{ceff45ee-c862-41de-aee2-a022c81eda92}"
"Extended"=""
"LaunchExplorerFlags"=dword:00000003
"MUIVerb"="@shell32.dll,-8518"
"MultiSelectModel"="Document"

[HKEY_CLASSES_ROOT\Folder\shell\opennewprocess\command]
"DelegateExecute"="{11dbb47c-a525-400b-9e80-a54615a090c0}"

[HKEY_CLASSES_ROOT\Folder\shell\opennewwindow]
"LaunchExplorerFlags"=dword:00000001
"MUIVerb"="@windows.storage.dll,-8517"
"MultiSelectModel"="Document"
"OnlyInBrowserWindow"=""

[HKEY_CLASSES_ROOT\Folder\shell\opennewwindow\command]
"DelegateExecute"="{11dbb47c-a525-400b-9e80-a54615a090c0}"

[HKEY_CLASSES_ROOT\Folder\shell\pintohome]
"AppliesTo"="System.ParsingName:<>\"::{679f85cb-0220-4080-b29b-5540cc05aab6}\" AND System.ParsingName:<>\"::{645FF040-5081-101B-9F08-00AA002F954E}\" AND System.IsFolder:=System.StructuredQueryType.Boolean#True"
"MUIVerb"="@shell32.dll,-51377"

[HKEY_CLASSES_ROOT\Folder\shell\pintohome\command]
"DelegateExecute"="{b455f46e-e4af-4035-b0a4-cf18d2f6f28e}"

[HKEY_CLASSES_ROOT\Folder\shellex]

[HKEY_CLASSES_ROOT\Folder\shellex\ContextMenuHandlers]

[HKEY_CLASSES_ROOT\Folder\shellex\ContextMenuHandlers\7-Zip]
@="{23170F69-40C1-278A-1000-000100020000}"

[HKEY_CLASSES_ROOT\Folder\shellex\ContextMenuHandlers\BriefcaseMenu]
@="{85BBD920-42A0-1069-A2E4-08002B30309D}"

[HKEY_CLASSES_ROOT\Folder\shellex\ContextMenuHandlers\Library Location]
@="{3dad6c5d-2167-4cae-9914-f99e41c12cfa}"

[HKEY_CLASSES_ROOT\Folder\shellex\ContextMenuHandlers\MBAMShlExt]
@="{57CE581A-0CB6-4266-9CA0-19364C90A0B3}"

[HKEY_CLASSES_ROOT\Folder\shellex\ContextMenuHandlers\PintoStartScreen]
@="{470C0EBD-5D73-4d58-9CED-E91E22E23282}"

[HKEY_CLASSES_ROOT\Folder\shellex\ContextMenuHandlers\{0A920327-8189-4514-86FF-48D5F9C75FD4}]

[HKEY_CLASSES_ROOT\Folder\shellex\ContextMenuHandlers\{a2a9545d-a0c2-42b4-9708-a0b2badd77c8}]
@="Start Menu Pin"

[HKEY_CLASSES_ROOT\Folder\shellex\DragDropHandlers]

[HKEY_CLASSES_ROOT\Folder\shellex\DragDropHandlers\{BD472F60-27FA-11cf-B8B4-444553540000}]
@=""

[HKEY_CLASSES_ROOT\Folder\shellex\PropertySheetHandlers]

[HKEY_CLASSES_ROOT\Folder\shellex\PropertySheetHandlers\BriefcasePage]
@="{85BBD920-42A0-1069-A2E4-08002B30309D}"

[HKEY_CLASSES_ROOT\Folder\ShellNew]
"Directory"=""
"IconPath"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,\
  74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,\
  00,68,00,65,00,6c,00,6c,00,33,00,32,00,2e,00,64,00,6c,00,6c,00,2c,00,33,00,\
  00,00
"ItemName"="@shell32.dll,-30396"
"MenuText"="@shell32.dll,-30317"
"NonLFNFileSpec"="@shell32.dll,-30319"

[HKEY_CLASSES_ROOT\Folder\ShellNew\Config]
"AllDrives"=""
"IsFolder"=""
"NoExtension"=""

If you don't know how to compare (automatically) this and yours:
- you can use these windows commands: comp or fc
- you can use notepad++ with the compare plugin
- paste or upload it here and I/we'll compare it