0x0000007b memory error for any .exe

Hey when ever any .exe is run it dumps a 0x0000007b memory error. I've replaced the .DLL for exes off the top of my head think it was summert like msi.DLL and still no good also ran Norton antivirus and although items were removed still no good did regserv32 with the .dll's and no result still same memory reference this is on a laptop running 64 bit home premium Any help is greatly...