I recently had a call from whom I thought was my broadband, company, as the call went on I realised that it was someone who was trying to hack into my bank details .As they asked for a card reader, as they wanted to refund me . An amount of money which was not true but cut the story short .They convinced, me that I needed to load some software, onto my computer. And now im worried my child is not safe on her computer . Could you please send me some advice what I should do . As she uses her computer for home work thank you
If you loaded their software into the computer then it is very likely that your PC is already hacked. I would suggest not to use it for banking, etc, or even for every day use.
The best thing i could suggest is to re-install whatever operating system you are running, as some of the viruses can inject itself to system kernel, which causes that it is very hard to delete the virus, or even find it.
NOTE: it is possible that virus would inject itself to programs on hard drive, or even your personal files. I would definitely suggest to do not leave any programs from previous install.
I guess that such virus would be RAT (Remote Administration Tool) which allows to do pretty much everything on your computer remotely without you even noticing it. RAT include, FTP server to download your files or upload new, Key-logger to steal whatever you type on keyboard, Screen capture software - so attacker can see what you see on screen, microphone and webcam capture - which allows attacker see you through webcam and listen through microphone, and that is just some parts of features such software may contain.
If you need files from your computer then I suggest to copy files using Live CD (e.g. Ubuntu), as attacker may make it harder to copy files or (if you e.g. using windows XP) they could use AutoPlay to infect fresh install of windows when you insert your USB or CD
To begin with, a thing to do could be to ensure that the operating system is secure. Consider whether you would need to reinstall the thing from scratch. That goes for both your computer and that of your child.
Next I strongly suggest that you look at the articles Educating Kids on Cyber Safety and Securing Your Home Network to get some basic information on what would be the best course of action for you. The other newsletters on this site are also very relevant, so consider reading a few of them.
But the basics and advice on how to behave can be found at: US-CERT.