You can unzip and untar those files with winzip. However, if you are on Windows (and I assume using ActivePerl) then you can install the modules using the ppm command:

C:\Temp>ppm

ppm> search Spreadsheet::WriteExcel
Searching in Active Repositories
   1. Spreadsheet-WriteEx~ [2.14] Write to a cross platform Excel bina
+ry file
   ...
ppm> install 1
[download]

Repeat for Spreadsheet::WriteExcelXML (it will be in the same list above) and choose the number for version 0.09.

If you are unfamilar with installing modules then you really should have a look at the first two tutorials in the section linked to above.

--
John.