I'm helping a colleague with some computer problems at home...
Suffice to say that Vet antivirus was installed and operating properly but for reasons best explained by the presence of children in the house it became deactivated somehow. One of them said they didn't know what Vet was and thought it might be a virus so removed it...
Anyway, the viruses basically locked up the machine preventing the downloading of anything and also preventing the successful reinstallation of Vet. So I have used a freeware program called "Avast" and detected 604 viruses on the machine today.
I have deleted all virus-containing files except Windows files (about 15 infected I think). This program was unable to repair those files but the removal of the other 589 viruses has enabled a successful start of the machine (but not installation of Vet) and backing up of personal files. (Yes I will properly scan those before using them!).
Now what to do?
Should I run Avast again to remove the other 15 or so infected files (which will probably make Windows inoperative?) and then re-install Windows? Yes they have all CD, code etc that came with the machine when new.
How, exactly, should I do this? Do I need anything apart from the Windows CD and code? Should I format C drive first and then re-install Windows or just get rid of the virus infected Windows files with Avast and then install windows again without formatting? The Windows version in question is XP Home Edition.
Most of the files deleted were internet-related and a few were music files so they shouldn't be too important although I did note that Internet Explorer has disappeared apart from the shortcut.
Or is there another, easier, way?
Any help greatly appreciated.
P.S. Yes I've had a few words to the kids about not removing the anti-virus software in future...