problemas al instalar pear en windows

[ing_aprendiz]

hola amigos del foro, he visto varios post con este tema la verdad que instalar pear es un camello se bajan todos los paquetes y siempre genera un error diferente, alguno de ustedes me podría informar de que se trata este error:

Código:

Welcome to go-pear!

Go-pear will install the 'pear' command and all the files needed by
it.  This command is your tool for PEAR installation and maintenance.

Go-pear also lets you download and install the PEAR packages bundled
with PHP: DB, Net_Socket, Net_SMTP, Mail, XML_Parser, PHPUnit.

If you wish to abort, press Control-C now, or press Enter to continue:

HTTP proxy (http://user:[email protected]:port), or Enter for none::

Below is a suggested file layout for your new PEAR installation.  To
change individual locations, type the number in front of the
directory.  Type 'all' to change all of them or simply press Enter to
accept these locations.

 1. Installation prefix           : C:\apachefriends\xampp\php
 2. Binaries directory            : $prefix
 3. PHP code directory ($php_dir) : $prefix\pear
 4. Documentation base directory  : $php_dir\docs
 5. Data base directory           : $php_dir\data
 6. Tests base directory          : $php_dir\tests
 7. php.exe path                  : C:\apachefriends\xampp\php\php.exe

1-7, 'all' or Enter to continue:

The following PEAR packages are bundled with PHP: DB, Net_Socket, Net_SMTP,
Mail, XML_Parser, PHPUnit.
Would you like to install these as well? [Y/n] : Y

Loading zlib: ok
Using local package: PEAR.............ok
Downloading package: Archive_Tar......ok
Downloading package: Console_Getopt....ok
Downloading package: XML_RPC..........ok
Bootstrapping: PEAR...................(local) ok
Bootstrapping: Archive_Tar............(local) ok
Bootstrapping: Console_Getopt.........(local) ok
Downloading package: DB...............ok
Downloading package: Net_Socket.......ok
Downloading package: Net_SMTP.........ok
Downloading package: Mail.............ok
Downloading package: XML_Parser.......ok
Downloading package: PHPUnit..........ok
Extracting installer..................
Invalid checksum for file "<?php
//
// +----------------------------------------------------------------------+
// | PEAR, the " : 30824 calculated, 0 expected

Warning: unlink(C:\DOCUME~1\PROGRA~1\CONFIG~1\Temp/gop18.tmp\PEAR.php): Permissi
on denied in C:\apachefriends\xampp\php\pear\go-pear.php on line 1081

Warning: rmdir(C:\DOCUME~1\PROGRA~1\CONFIG~1\Temp/gop18.tmp): Directory not empt
y in C:\apachefriends\xampp\php\pear\go-pear.php on line 1085
Presione una tecla para continuar . . .

estoy tratando de instalar pear sobre windows para poder correr el paquete
Spreadsheet_Excel_Writer

gracias