I have a macro which tells Excel to run through a list of cells
and print a worksheet if the content of the cell satisfies two
conditions. The first one is that the content of the cell should
match the content of a cell named "Restrict". This works.

The other condition is that the cell should not contain a question
mark. I can't get this to work. The macro works fine if I let it
look for a "?" and then print if it finds one - but I want the
opposite, cells with "?" in them should be ignored.

This is the code that works:

If Left(ActiveCell, Len(Range("Restrict"))) = Range("Restrict") _
Then
If InStr(1, ActiveCell, "?") Then

[Code for print-out]

End If
End If


I've tried to amend the second line like this:

If Not(InStr(1, ActiveCell, "?")) Then

and

If InStr(1, ActiveCell, "?") = 0 Then

but when I try to run the macro, Excel freezes up before
finishing.

What am I doing wrong here??