http://i46.tinypic.com/34hctvp.jpg
Theres a few ways and choices of how to do this but they all need a VBA script
this one will highlight the current row to the left of the current selection , see pic in link.
To change the highlight colour you need to change the ColourIndex value, the colours and their numbers can be found with a google search
In Excel make sure you can see the Developer Tab then click on VBA and make sure your screen is showing the same as my screenshot (attached), your VBA window may be slightly differnt because it will show your worksheet names
click on Sheet 1 or whatever your sheet is called and put the script at the bottom of this post in.
Make sure its exactly as in my screenshot, and save the workbook as macro enabled .xlsm or whatever version of Excel you use equivalent.
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
With Target
If .Cells.Count > 1 Then Exit Sub
Application.ScreenUpdating = False
Cells.Interior.ColorIndex = xlColorIndexNone
Range(.Address, Cells(Range(.Address).Row, 1).Address).Interior.ColorIndex = 24
Application.ScreenUpdating = True
End With
End Sub