I found this mysterious file on my computer. What is it? and how can I undo any damage it might have done?

These folks are discussing it here.

thanks :)

It’s seems to be a keygen (for Adobe creative suite 5 programs). A keygen is a program that generates serial numbers so you can install a computer program without having to pay for it. Most antivirus will report keygens as malware (often as a trojan) and they are sometimes used to deploy malware to unsuspecting users but from looking at the comments on TPB this one seems to be genuine keygen. So you might have been lucky this time but the number one way to avoid problems is not to run programs that you don’t recognise, don’t know where they cam from and don’t know what they do.

Thanks I will be more careful next time…curiosity is often stupid isnt it