Malwarebytes Anti Malware (MBAM). Full scan.
Uninstall any other antivirus you have and install Microsoft Security Essentials; it's 100% free, it's the best you can get.
If you're running Firefox, install Adblock Plus and NoScript. I suggest you run Firefox if you're not.
I don't mean to sound patronizing, and I have no idea what this problem is related to specifically... but to be safe stay off porn and religious sites, haha. Just make sure you're not clicking on anything shady, especially weird links sent to you through the email.