I am getting a screen flash every 5 minutes(exactly). Each time it flashes it adds another icon to the Taskbar. The icon's are a blue hexagon with a white letter N. Hovering on the icons removes them
Event Viewer tells me the source is .Net Runtime Event ID 1022 and the explanation is:-

.NET Runtime version 4.0.30319.0 - There was a failure initializing profiling API attach infrastructure. This process will not allow a profiler to attach. HRESULT: 0x80004005. Process ID (decimal): 2388. Message ID: [0x2509].

Which is fine, but has anybody have any ideas how to sort this?

I have the latest Net Framework installed.