Help with MSIVX error/virus

My computer, running Vista, has been going extremely slowly and I am pretty sure it has a virus. Sorry I am a bit clueless.  

When I open safari a Safari.exe- Bad Image box pops up, saying: globalroot\systemroot\system32\MSIVXuxnydeewqqluvdbdhrflxdjtldtawee.dll is either not designed to run on Windows or it contains an error... 

How do I go about fixing this? Norton cannot find anything.