Today when I started my laptop, up McAfee Virus Scan came up with a screen which said (I've Left out computer names and dates as they are irrelevant):
NameivX EKG
Source: (Blank)
Detected as: Generic.dx
Type: Trojan
Status: Deleted
Application: C:\ Windows Explorer.exe
In folder: C:\Program files/DivX/DivX Codec
Client ID: I 0

I confess, I have been downloading some illegal material (approx.15 films) and watching them on DivX.
Thanks for all the answers, will give a best answer to the person with
the most correct information.
Thanks!