The first two domains work as intended. The second two fallback to the first domains folder..

For instance if I put http://emachineupgraders.localhost/ into the address bar, the content for http://ctechinfo.localhost/ is displayed.

Code:
#
# Virtual Hosts
#
# If you want to maintain multiple domains/hostnames on your
# machine you can setup VirtualHost containers for them. Most configurations
# use only name-based virtual hosts so the server doesn't need to worry about
# IP addresses. This is indicated by the asterisks in the directives below.
#
# Please see the documentation at 
# <URL:http://httpd.apache.org/docs/2.2/vhosts/>
# for further details before you try to setup virtual hosts.
#
# You may use the command line option '-S' to verify your virtual host
# configuration.

#
# Use name-based virtual hosting.
#
#NameVirtualHost *:80

#
# VirtualHost example:
# Almost any Apache directive may go into a VirtualHost container.
# The first VirtualHost section is used for all requests that do not
# match a ServerName or ServerAlias in any <VirtualHost> block.
#

NameVirtualHost *:80

<VirtualHost *:80>
    ServerAdmin postmaster@dummy-host.localhost
    DocumentRoot "C:/Program Files (x86)/Apache Software Foundation/Apache2.2/htdocs/ctechinfoNEW"
    ServerName ctechinfo.localhost
    ServerAlias ctechinfo.localhost
    ErrorLog "logs/ctechinfo.localhost-error.log"
    CustomLog "logs/ctechinfo.localhost-access.log" combined
</VirtualHost>

<VirtualHost *:80>
    ServerAdmin postmaster@dummy-host.localhost
    DocumentRoot "C:/Program Files (x86)/Apache Software Foundation/Apache2.2/htdocs/dslwebserverNew"
    ServerName domain4.localhost
    ServerAlias dslwebserver.localhost
    ErrorLog "logs/domain4.localhost-error.log"
    CustomLog "logs/domain4.localhost-access.log" combined
</VirtualHost>

<VirtualHost *:80>
    ServerAdmin postmaster@dummy-host.localhost
    DocumentRoot "C:/Program Files (x86)/Apache Software Foundation/Apache2.2/htdocs/timberindustryinformationNEW"
    ServerName timberindustryinfo.localhost
    ServerAlias timberindustryinfo.localhost
    ErrorLog "logs/timberindustryinfo.localhost-error.log"
    CustomLog "logs/timberindustryinfo.localhost-access.log" combined
</VirtualHost>

<VirtualHost *:80>
    ServerAdmin postmaster@dummy-host.localhost
    DocumentRoot "C:/Program Files (x86)/Apache Software Foundation/Apache2.2/htdocs/emachineupgraders"
    ServerName emachineupgraders.localhost
    ServerAlias emachineupgraders.localhost
    ErrorLog "logs/emachineupgraders.localhost-error.log"
    CustomLog "logs/emachineupgraders.localhost-access.log" combined
</VirtualHost>