Hello

1)

D:\Inetpub\vhosts\domain.com\httpdocs\phppear\PEAR>dir *validate*
 Volume in drive D has no label.
 Volume Serial Number is 4C76-AE4A

 Directory of D:\Inetpub\vhosts\domain.com\httpdocs\phppear\PEAR

06/21/2009  08:51 AM            40,643 Validate.php
               1 File(s)         40,643 bytes
               0 Dir(s)   5,115,588,608 bytes free

SO , as you can see the file exist under the PATH:
D:\Inetpub\vhosts\domain.com\httpdocs\phppear\PEAR

2)

D:\Inetpub\vhosts\domain.com\httpdocs\phppear\PEAR\PEAR>dir *validate*
 Volume in drive D has no label.
 Volume Serial Number is 4C76-AE4A

 Directory of D:\Inetpub\vhosts\domain.com\httpdocs\phppear\PEAR\PEAR

06/21/2009  08:14 AM            22,064 Validate.php
               1 File(s)         22,064 bytes
               0 Dir(s)   5,115,326,464 bytes free

SO , as you can see the file exist under the PATH:
D:\Inetpub\vhosts\domain.com\httpdocs\phppear\PEAR\PEAR

3)

I already understand that Class 'PEAR_Validate' is not part of the PEAR 
Validate package.
PEAR_Validate is part of PEAR
You can see it on the following URL:
http://pear.php.net/manual/en/core.ppm.php

So the conclusion is that PEAR_Validate class is not part of
http://pear.php.net/package/Validate

it's class which belongs to PEAR package it's self and not the validate 
package.

4)

I tried to upgarde the PEAR package to the latest version/revision:

D:\Inetpub\vhosts\domain.com\httpdocs\phppear>"d:\inetpub\vhosts\domain.com\httpdocs\phppear\pear.bat" 
upgrade PEAR

Notice: Use of undefined constant PEAR_VALIDATE_DOWNLOADING - assumed 
'PEAR_VALIDATE_DOWNLOADING' in PEAR\Command\Install.php on line 584

Fatal error: Class 'PEAR_Validate' not found in 
D:\Inetpub\vhosts\domain.com\httpdocs\phppear\PEAR\PEAR\ChannelFile.php on 
line 1514

5)

I tried to install Mail-1.2.0b2 package:

pear.bat install --alldeps Mail-1.2.0b2

Fatal error: Class 'PEAR_Validate' not found in 
D:\Inetpub\vhosts\domain.com\httpdocs\phppear\PEAR\PEAR\ChannelFile.php on 
line 1514

7)

How to resolve the issue ?
I dont want to delete the PEAR directory.
This is the easy resort. I want to find the source of the issue.

THIS IS THE CHALLENGE !!!

thanks in advanced.