Since you are experiencing this problem, I would like you to try and boot your computer in Safe Mode, which loads Windows with only the necessary drivers, then try using IncrediMail again.
To boot your Windows in Safe Mode, please do the following:
1. Print out these instructions so you can follow them after restarting your computer.
2. Restart your computer.
3. Before Windows starts, press the 'F8' key on your keyboard.
4. Select the 'Safe Mode (with Networking)' option from the 'Mode Select' menu.
After Windows starts up, open IncrediMail and let me know if the problem continues to occur.
Please Note: To restore your computer to its normal state, simply reboot it.
IncrediMail Customer Support