Today I was trying to uninstall some application and I was very surprised to see this entry in my applications list

Then I try to find what is this and I finally found it in "Program Files". After I opened the application and explored it a little bit I found this window

The email address you see is my spouse's email address. What I see from this is that my spouse has installed this application to spy on my computer and then send reports to her email.
What I should do with my computer?

Change all your passwords! (no one had mentioned this)

This is assuming that you're going to take an open approach to this problem rather than engage in counter-spying or image manipulation of your own. It's fairly basic advice, but do this on a computer you trust (this one cleaned or at work), and don't re-use any of your old passwords. Personally, I like using LastPass to store my passwords (generally random characters) but your mileage may vary.

If you have things to hide (or just value your privacy) consider also using TrueCrypt to encrypt your system drive - you have a terrible security situation in that the attacker has physical access to the computer so let's make it hard for them to read the data while you're away.

And then, on a personal level, perhaps prepare for the worst regarding your relationship. The fact that she (or he) installed this either shows a desire to leave anyway, or a serious lack of trust from them - and if that's not recognised and dealt with, it underlies all your dealings with each other.

Update: On the passwords/account compromised note, you may want to check key accounts to make sure the recovery details haven't been changed or that no forwarding is going on. For example: GMail lets you set recovery options (click on your face - account - security - recovery) or set up a filter that silently forwards everything (gear icon - settings - filters). Consider setting up two-factor authentication on accounts that support it and look for ways to log-off other sessions. Google has a checklist that covers some other things.
