You've been hit with a crappy, low-brow attempt at compromising your computer/device. You aren't the first, you won't be the last.
There are at least two different variants (that I've examined); There are certainly more.
Regarding the link...
When you say you 'could not open it,' can you be more specific? What happened when you clicked the link?
If you're running an up-to-date and properly configured Windows OS, and it prevented you from using the link, then you're most likely okay, as what these links typically point to is a zip archive. You're told a list or a photo is being provided, and with that, the intent is that you download said archive, open/extract it locally, and execute the payload. One's desire to make a sell is being exploited.
Current versions of Windows are pretty good at catching this sort of attack before anything bad happens... again, assuming proper updates/config are in effect, and that one doesn't ignore the OS's warning and download/extract/execute anyway.
On the other hand, if you downloaded a file of any kind, tried to open it, and it *appeared* that nothing happened... well, something might very well indeed have happened. It's difficult to ascertain precisely what that is, but it could be something that won't immediately be apparent; Could be something scheduled to happen days or weeks later, after you've forgotten all about the message having been received in the first place.
If the latter's the case, then I have little to offer that hasn't already been suggested... scan for viruses, malware, rootkits, keyloggers, etc. Might even be worth getting a pro to have a look. Prior to that, shutting down the system ASAP might be a good precaution, as there's no telling what might be happening right now, as you read this.
Not trying to needlessly alarm you, but in situations like this, alarm's all too often the apt reaction.
Regards.
