I volunteer in the IT department at a local nonprofit (I eventually hope to up-convert that to gainful employment there or somewhere else), and had a user come in today who had been having trouble with Skype. He called what may or may not have been Skype tech support, which told him that Skype was not the problem and that his computer is infected. They claimed that the antivirus suite we use at our site "wasn't working" and ran a third party diagnostic tool, which *seems* to be clean, but sets off alarm bells in my head. They left him a number to call back for paid support, which also seems suspicious. (Indeed, just after writing that last sentence, I checked the Skype website: they don't offer telephone support. So if his computer wasn't infected in the first place, it may well be now. ARRRRRGH!).
Moral: *PLEASE* make things easier for your IT department by calling them *first* when you have an issue on a work machine (or a home machine that they support, if applicable), before calling external tech support. If the issue is something that external tech support truly needs to be contacted about, your IT department can do it, or they can direct you to an external support number that they know is valid.