Hide columns and rows using count rows/colums

New to VBA/Macros

Trying to hide all rows and columns not being used in a sheet that has a fixed/finite design.

Because this will be used in 2003/2007/2010 excel, need to have variable set for rows/columns hidden.

last row is 605, last column is AY everything below and to the right needs to be hidden.

?any suggestions?

Thanks in advance for your assistance!

RLD