Apache Access Log File Reset

Wow, 6GB log file!
OK, so you will likely want to use a tool like rotatelogs or cronolog to automatically split your log file as it gets larger.
In your Apache configuration file (httpd.conf or apache.conf ?) you'll need to find the line that mentions your access.log file that is huge.

*Before making any changes to this config, make a backup copy of this file*

For example (don't copy this litterally) you might have the following currently:

CustomLog log/access.log combined 

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You would want to change that to (untested):

CustomLog "||C:/path/to/cronolog.exe log/%Y-%m-%d-access.log combined"

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Take special notes of the quote marks ", the pipes |, the %Y%m%d bit to date the logs and pointing to the specific path of your log rotation tool. By default this will create a new log every day.

You should then run the check configuration tool, which should be in the start menu and then do a graceful restart of Apache for it to load this new configuration.

You can find out more here:
http://cronolog.org/usage.html
http://httpd.apache.org/docs/current/logs.html#piped

rotatelogs should be in your apache directory somewhere, or cronolog can be downloaded from:
http://cronolog.org/download/index.html

This is what I have presently:

<IfModule log_config_module>
    #
    # The following directives define some format nicknames for use with
    # a CustomLog directive (see below).
    #
    LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
    LogFormat "%h %l %u %t \"%r\" %>s %b" common

    <IfModule logio_module>
      # You need to enable mod_logio.c to use %I and %O
      LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio
    </IfModule>

    #
    # The location and format of the access logfile (Common Logfile Format).
    # If you do not define any access logfiles within a <VirtualHost>
    # container, they will be logged here.  Contrariwise, if you *do*
    # define per-<VirtualHost> access logfiles, transactions will be
    # logged therein and *not* in this file.
    #
    CustomLog "logs/access.log" common

    #
    # If you prefer a logfile with access, agent, and referer information
    # (Combined Logfile Format) you can use the following directive.
    #
    #CustomLog "logs/access.log" combined
</IfModule>

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Yeah, so depending on where you have put your log rotation tool, change line 21 to *something* like:

CustomLog "||C:/path/to/cronolog.exe logs/%Y-%m-%d-access.log common"

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Do I just download cronolog and copy it to the server as there does not look like there is any sort of installation procedure.  Also that application looks like it si from 5+ years ago on their website.  Please confirm when you get a chance.