For those that used Skype, there's a easier way to gain access to the log file rather then print screen. As long as you had been communicating with your spouse from the same computer, Skype have a history of your chat session from day 1. I'd used this program to export my chat session with my wife which dated back to Jan 2010.
Tried to post a direct link to download but it was not allow. Do a google search "SkypeLogView", it the first search result. Download this program (it free for personal use), this program will allow you export the log into text/csv/html/xml file format.
Skype Log Files Location
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In Windows XP, Skype Log files are stored under C:\Documents and Settings\[Profile
Name]\Application Data\Skype\[Skype User]. In Windows Vista\7, the
log files are stored under C:\Users\[Profile
Name]\AppData\Roaming\Skype\[Skype User].
Using SkypeLogView
==================
SkypeLogView doesn't require any installation process or additional dll
files. In order to start using it, simply run the executable file -
SkypeLogView.exe
If Skype is installed on your system, SkypeLogView automatically detect
the last used account, and loads the logs from it. You can select to view
the logs of another account by using the "Select Logs Folder" option.
After you loaded the right logs, you can select one or more items from
the list, and then save them to text/csv/html/xml file.
Hope this help.