So, I have a (potential) problem. A couple of hours ago I had a few tabs open in Google Chrome, one of which was Grooveshark (a music-streaming website I often use). I had a few songs playing and went to the bathroom to shave. When I came back a few minutes later, the music had stopped and the page had been re-directed. There was a red logo in the top left-hand corner (that I think was made to resemble that of Adobe) and from what I remember the page was suggesting that something needed to be downloaded/updating (foolishly, I instinctively closed the window straight away as I feared something dodgy was up. If I'd been thinking straight, I would've written down what was on my screen as that would have been more helpful!). What's more, there was a tab at the bottom of the page apparently showing that two things had been downloaded already (one of which I'm pretty sure was 'set up', and I think the other was something ending in'.exe.', but I'm not totally sure about that.
To be honest, I'm a real technophobe, but I've been using PC laptops long enough to know when something's abnormal, and that certainly was. Pages shouldn't automatically re-direct like that (I've used Grooveshark for years and it's never happened to me before on there), and things shouldn't be automatically downloaded without your permission. Also, the fact it resembled an Adobe update page, but clearly wasn't, is very fishy. I've run a 'full system' and 'smart scan' check with my free Avast anti-virus program, but nothing showed up. I'd be really grateful if you could help me out with this and make sure nothing bad has happened to my computer.
Thanks very much for reading, and I look forward to hearing from you!