Recently we had to install PEAR PHP library in WAMP (Windows, Apache, PHP, MySQL) environment. Trying to search www.wampserver.com website brought to our attention a lot of issues when people were trying to install it, also most of those how to guides and forum posts were quite outdated (2005/2006).
The following easy-to-follow tutorial has been practically tested with WAMP server (PHP version 5.2.10) in Windows 7 64 bit, besides this will work the same way in Windows Vista and XP, both 32 and 64 bit as well.