WLM inaccessible – works only in background

I've been using Windows Live mail for years and suddenly its started behaving strangely.

When I click to open it takes a while, then is visible in the taskbar but won't open on the screen.

When I hover my pointer over the icon, it shows the small popup, but it won't open in a window where I can use it.

I've searched this forum and others to no avail.

Have tried many suggestions but nothing works.

Before I uninstall I would prefer to have a fix.

Help will be appreciated.

Regards