Thanks ETF.

Yep, downloaded bitcoin core, and left it running to update the core blocks, it had done up to around 2011. I came back home couple hours later, and looks like it has terminated itself. Program not visible, not hiding in tasktray either. Gone from windows processes.

I ran it again and get error that it needs reindexing.
http://prntscr.com/vxd4yv

So I ran from the command line;
C:\Program Files\Bitcoin>bitcoin-qt.exe -reindex
And that says cannot obtain a lock on data directory, Bitcoin core is probably already running.

Not sure wether to believe the first error or the second one.