WINDOWS ACCESS VIOLATION

can anyone tell me why m i having problem in installation of iolo anti virus program… it say that i have to restart my windows before i can install my iolo antivirus software … but i keep havin the same message popping out again even thou i have remove all other antivirus software… after that another message says “ACCESS VIOLATION AT ADDRESS 0064264D IN MODULE IOLO AV.EXE READ OF ADDRESS 0000004”