Yep, me too - 4 machines, all running Windows 7 and MSE and I've not had any issues at all. And being as the minimum RAM is 2GB on said boxes, 80-100Mb is not particularly heavy (about as much as a normal Firefox session)..

Could be System Tool 2011.

That's it! The desktop shown on this page is exactly what I saw on both occasions, and the rest of it fits in.

I'd installed the free version of MalwareBytes so I wonder if somehow it auto-cleaned it...maybe not. Anyway I've printed the MalwareBytes forum page out so if it re-occurs I'll know a bit more. Might even put the MB install file on a CD (and a few other useful utilities) to be able to get it onto the infected PC.

It's fairly clear that the system has been compromised, even though you no longer see signs of it. Systems don't fix themselves, and few anti-malware products are so good that they can return a system to pristine condition without user intervention. Malware, on the other hand, can be very good at hiding itself.

I would be extremely suspicious of this system and work on the basis that, although it is now not evident, it is compromised. Who knows what key-loggers, remote-control applications, or Spam factories could be hidden on it. It should either be thoroughly cleaned or, better IMO, wiped and the OS re-installed.

Quite agree. But the PC is only used for 'social' activities, nothing financial or the like, I'll wait for him to get back to me with a problem. And then, once again, I'll have to reinstall the OS when I have the time, which is distinctly short these days. I'm wondering whether he's on Facebook or similar as one report I saw suggested it may be coming via a rogue app.

Anyway they're on holiday for two weeks so nothing will happen for a while.

I got infected by it over the weekend after visiting the london stock exchange web site. There is some news about it on the BBC

Can you provide a link?

In reply to a post by BatBoy:

Can you provide a link?

sorry carnt of my phone, but if you click on a news story, its in the box on the right which says most popular. Britons caught out by bad web ads

http://www.thedrum.co.uk/news/2011/03/02/19188-thous...

Cheers.

This comes as a criminal investigation is launched into how hackers were able to compromise the computers used by ad firm Unanimis, which places adverts on several popular UK sites in addition to the LSE, including Autotrader and the Vue cinema chain.

That's why I use Firefox and Ad Block Plus