wbTarget.Sheets(\"Sheet1\").Range(\"A1:W79\").Value = wb.Sheets(wsSource.Name).Range(\"A1:W79\").Value
I have this code which works pasting the values
You need to use Copy, and PasteSpecial xlValues and PasteSpecial xlFormats.
' Copy
wb.Sheets(wsSource.Name).Range("A1:W79").Copy
' Paste Special
wbTarget.Sheets("Sheet1").Range("A1:W79").PasteSpecial xlValues
wbTarget.Sheets("Sheet1").Range("A1:W79").PasteSpecial xlFormats
Read about Range.PasteSpecial here MSDN