How can I fix my computer when system restore wont even run?

Q: My friends computer is going haywire. None of the programs or files are opening. We cannot access the internet and we cannot do a system restore.

All the files say that they are infected and/or corrupt. It is a trojan virus…possible ldpinch v. as this is what has come up. Do you have any idea what I should do to fix it?

We are also getting bankerfox.a and it is coming from a website called antivirus live, which is also known as windows-anti virus .net.