Hi, Out of the blue, I cannot open Windows Live Mail

has been working fine until today - always says " windows live mail has stopped working" - I have uninstalled and reinstalled essentials but still doing it - tried taking off AntiVir, and still did it - have ran win repairs and still doing it - i am on Acer comp, using Windows 7.
Is working fine on my other laptop - this one used to go well until today. Have tried all solutions as suggested on internet and still no joy. Any help to resolve would be much appreciated.