I was using Nod32 version 3.0.566.0 surfing a site & suddenly nod32 goes nuts, It seems to have been crippled & defeated by this ultimate virus which I did some research on. It completely destroyed my windows. Good thing I have another hard drive on a another computer for backup & repartition & format my harddrive again. . It is called a metamorphic virus which i found out when I did some research.. It somehow attack nod32 self defense first & after disabling nod32, it downloads other virus into your computer. It works like AIDS. ' Here is the definition. Metamorphic Viruses can reprogram itself. Often, it does this by translating its own code into a temporary representation, edit the temporary representation of itself, and then write itself back to normal code again. Metamorphic code is more effective than polymorphic code. This is because most anti-virus software will try to search for known virus-code even during the execution of the code. Whether Heuretics & proactive defense & behavioral analysis can effectively stop these next generation of mallware, that remains to be seen. Eset should do something about the ultimate virus.