These are the instructions for installing ArArCALC on your Windows computer: 

* Start WinZip (http://www.winzip.com/download.htm) for Windows 95/98/NT/2000/XP and open the downloaded "ArArCALC220c.zip" file
* In WinZip extract the ArArCALC files and directories to the hard disk of your own choice but set the following options: 

	[1] check "Replace Existing Files" 
	[2] check "Use Folder Names"

Note that you always have to make a copy/backup of your old "ArArCALC.log" file which contains all your project names and irradiation constants. In this way you do not have to re-enter all this info over and over again when installing a newer version of ArArCALC on top of your current installation. Also note that ArArCALC now can be installed in a subdirectory.

* Start Excel 97-2000-XP for Windows 95/98/NT/2000/XP
* Install the ArArCALC add-in via ... Tools # Add-Ins: 

	[1] choose browse
	[2] open "ArArCALC.xla" from the ... \ArArCALC\Program\ ... directory

* In more recent versions of Excel set the security level to "Medium" via the ... Tools # Macros # Security menu
* Start ArArCALC via the ... Tools # ArArCALC menu

ArArCALC is now up and running. But to be able to calculate your first data reduction you first have to set some parameters in ArArCALC.

* Goto the preferences dialog box via the ... Options # Preferences menu
* Set your password in the "Password" tab
* Set pathname for your data files in the "Files" tab
* Set your lab info in the "Lab" tab
* Configure your input filter in the "Input Filter" tab

The last point is most critical during the installation of ArArCALC. If the input filter is not properly configured, error messages indicate that the predefined input filter is not usable for the opened mass spectrometry data file. If all preferences have been set correctly please continue to add your own projects and to set your own irradiations constants.

* Goto the irradiations and projects dialog box via ... Options # Irradiations and Projects
* Add your Projects
* Add your Irradiations
* Now you are ready to reduce your first mass spectrometry datafile in ArArCALC via the ... Program # Open # Raw Intensities menu
