To make sure you are not threaten by the dangerous virus infection, you should get a professional way to check the virus infection on your computer, and remove all of them once detected. A professional antivirus program will be a good choice to scan and remove viruses. And there are plenty of free antivirus programs available on the internet such as Avira Free Antivirus which share good reputation, here is a quick instruction to teach you how to manage such virus issue.
Some addons are standalone, and are able to run without any additional addons being installed; others can require certain other addons to be installed to work at all, or integrate with other addons to provide additional functionality. Collections of addons that have been put together to form a coherent user interface are sometimes referred to as UIs.
We push multiple alpha versions to Curse on an average day, these versions may contain important new features or bug fixes for the bleeding edge raid content... These versions are tagged as alpha, so they will not be downloaded by default. Set your Curse client to update to alpha if you want these latest versions (but they may contain bugs, downloads tagged as "Beta" or "Release" are more stable)
Often the name modification (or "mod" for short) is used interchangeably with AddOn. More specifically, a mod is a third-party AddOn that alters or enhances some aspect of the game's interface. Mods can perform a wide variety of tasks, including adding new buttons to the screen, altering the built-in player and party frames. In extreme cases, mods completely supplant the standard game's interface, usually offering more advanced functionality.