MT4 stopped opening after update

[[Deleted]]

I was asked to do an update via Liveupdate a couple of days ago. Immediately after the download completed MT4 opened autotmatically with no problems but now I have tried to go back into it it won't open on my computer. If I try to reinstall MT4 it tells me that it is already open even though I cannot see any sign of it and I need to close it before reinstalling.

Could you help with this please?