Cheers bergauk, turns out that Skype was just acting up for that time. Quite odd really.
Anyway, last night my sister comes to me and says that she got a pop-up anti-virus program thing from her web browser. As soon as she said that, I was intrigued. And then when I saw it, I was horrified.
Horrified at the implict tone of the pop up trying to be a proper, legal anti-virus (horror horror!) and also a sneaking admiration for those rather devious fellows to present something that actually looked like a legit anti-virus scanner. It was called "Win 7 2011 Anti-virus (something-something)". Oh my, it was a difficult program to kick off the laptop... This was at midnight, just before I decided to go to bed. Ended up being awake till 3am (told sister to go to bed after 1am, as it was a slow process getting rid of it!).... God.
The program basically (somehow) inflitrates the web browser and then keeps popping up with scareware pop up designed to make you think you had 50 odd viruses running amok in the laptop/computer. After about five minutes of it actually being shown, the program somehow deactivated all installation and exe files. Only for anti-viruses and updated programs. I also deleted something that was a script that was written by the program to stop the pop ups, which stopped pretty much any exe being run. Ooops.
Long story short, Malwarebyte was downloaded onto a networked computer, laptop was in safe mode with networking, navigated to the correct folder for malwarebyte exe and ran it with admin rights (user rights was still blocked off) and ran a full scan. Found 3 malicious files. Nuked it.
And so far, the laptop seems to be ok. Also updated Firefox to 9.0 and updated Win 7 (which was last Tuesday's updates, I believe).