The FBI in the United States have ceased control of the servers used to control the "highly sophisticated" malware (malicious software).
What makes matters worse for those infected is that GameOver Zeus also distributes the extremely aggressive "cryptolocker" virus which encrypts personal files on a user's PC such as photographs and demands a ransom be paid in the region of £300 to regain access. Cryptolocker has been a problem for some time now and it seems that it is not going away any time soon.
As usual the advice is to ensure your computer is protected with a good ant-virus product such as the excellent and free Microsoft Security Essentials or even better, an full Internet Security package such as the multi-award winning Bullguard Internet Security and that whichever product you use, that it is kept up to date and scan your computer regularly.
Also take a look at Get Safe Online, a government backed website where you can download a free tool tailored to detect and remove this threat as well as further, more detailed information regarding this threat.
As always, if you need help or assistance, or if you think your computer may already be infected, get in touch!