In support of this post:
http://www.excelfox.com/forum/showth...ge36#post12628

Note a new modification... for the case of when a cell in Device Manger is coloured ( indicating a match to drivers ) but the case when no match is found in DriverStore. We then need to make the underline which we are using as an indication for a match to drivers
Code:
            Else ' No match was found - the thing in the cell in this worksheet is not in the other worksheet
                If SrchForCel.Font.Color <> 0 Then Let SrchForCel.Font.Underline = True 'we need an extra check for if the cell is already coluoured indicating a match in drivers
            End If
Code:
Sub CompareDriverFilesDeviceManagerInDriverStore2() '
Rem 0
    If ActiveSheet.Name <> "DeviceManagerProperties" Then
     MsgBox prompt:="Oops": Exit Sub
    Else
    End If
Rem 1 Worksheets info
Dim WsDMP As Worksheet, WsDrSt As Worksheet
 Set WsDMP = Worksheets("DeviceManagerProperties"): Set WsDrSt = Worksheets("DriverStore")

Rem 2 Looking at each cell in the selection
' Random number between 3 and 56 to get color index for any matching file names (1 is black, 2 is white , up to 56 is other colors:  3 to 56   is like  (0 to 53)+3  Rnd gives like  0-.99999  so (Int(Rnd*54))+3  is what we want
Dim ClrIdx As Long
 Randomize: Let ClrIdx = (Int(Rnd * 54)) + 3

Dim SrchForCel As Range
    For Each SrchForCel In Selection ' Take each cell in selected range. Each should be a cell in DeviceManagerProperties
    Dim CelVl As String: Let CelVl = SrchForCel.Value
        If CelVl <> "" And Left(CelVl, 3) = "C:\" And InStr(4, CelVl, ".", vbBinaryCompare) > 1 Then ' use some criteria to check we have a file path
        Dim FileNmeSrchFor As String
         Let FileNmeSrchFor = Right(CelVl, (Len(CelVl)) - (InStrRev(CelVl, "\", -1, vbBinaryCompare))) ' Determine the file name as that looking from the right as many characters as (the total character number) - (the position looking from the right of a "\")  ---   the characters count left over after the subtraction is equal to the character length of the file name
        Rem 3 We now should have a file name, so we look for it in worksheet  DDAllBefore
        Dim SrchRng As Range: Set SrchRng = Application.Range("=DriverStore!D5:DriverStore!F4437")    '
        Dim FndCel As Range: Set FndCel = SrchRng.Find(what:=FileNmeSrchFor, After:=Application.Range("=DriverStore!D5"), LookAt:=xlPart, searchorder:=xlNext, MatchCase:=False) '
            If Not FndCel Is Nothing Then ' the range is set, so the file string has been found in a cell in  DDAllBefore
            Rem 4 we have two matching cells
            '4a) but we might already have a match,
                If SrchForCel.Font.Color <> 0 Then ' Extra things to do if we already found the cell value in drivers
                 Let ClrIdx = SrchForCel.Font.ColorIndex ' this will make the line below to colorthe text of this cell redundant but will ensure that we use the same color in the DriverStore worksheet rather than the randomly generated one
                 WsDMP.Activate: SrchForCel.Select
                 Let SrchForCel.Font.Underline = True
                Else
                End If
            'Debug.Print FndCel.Value
              Do While Not FndCel Is Nothing ' Start Find next loop ======
              '4b) color matching file names in each worksheet, we do the unecerssary activating and selecting so we can see what is going in
                WsDMP.Activate: SrchForCel.Select ' This worksheet will be colured
                Application.Wait (Now + TimeValue("00:00:01"))
                'Let SrchForCel.Characters(((InStrRev(CelVl, "\", -1, vbBinaryCompare)) + 1), (Len(CelVl)) - (InStrRev(CelVl, "\", -1, vbBinaryCompare))).Font.ColorIndex = ClrIdx
                Let SrchForCel.Font.ColorIndex = ClrIdx
                Let SrchForCel.Font.Italic = True
                
                WsDrSt.Activate: FndCel.Select ' the other workseet
                Application.Wait (Now + TimeValue("00:00:02"))
                Let FndCel.Font.ColorIndex = ClrIdx
              Set FndCel = Application.Range("=DriverStore!D" & FndCel.Row + 1 & ":DriverStore!F4437").Find(what:=FileNmeSrchFor, After:=Application.Range("=DriverStore!F4437"), LookIn:=xlValues, LookAt:=xlPart, searchorder:=xlByRows, SearchDirection:=xlNext, MatchCase:=False)  '
              Loop  '  End Find next loop =================================
            Else ' No match was found - the thing in the cell in this worksheet is not in the other worksheet
                If SrchForCel.Font.Color <> 0 Then Let SrchForCel.Font.Underline = True 'we need an extra check for if the cell is already coluoured indicating a match in drivers
            End If
        Else ' case no file path string in cell
        End If
    Next SrchForCel
End Sub