cannot follow hyperlink error

I have a combo box that on the after update event I pu together a string for a hyperlink
i write that string to label caption and then write that string to the subaddress of the label

the string location is correct because i can click the start button and paste the string there and it will launch the pdf as will the run box (remember that on)

But when I click the hyperlink on the label I receive the following message:

mydatabe cannot follow the hyperlink mystring
Please verify the desination
the string is valid and here is the code

Private Sub List344_AfterUpdate()
Dim strlocation As String
Dim strfolder As String

strfolder = DLookup("[userdefinedfield1]", "tblsystemadmin", "cmselement='safety profile'")
strlocation = strfolder & "\" & List344 & ".pdf"

lblHyperlink.Caption = strlocation
lblHyperlink.HyperlinkSubAddress = strlocation

End Sub


any help would be so greatly appreciated