Windows Defender is not antyvir this is first program what any trojan/virus disable, better invest for any top of antyvirus
and dont try mcafee, avg, avast, gdata, norton or less knowing names have many troubles
u can choice betwen : kaspersky, bitdefender, eset
crack have my exepacker routine so no one antyvir have this signature, so all antyvir can show u vir becouse dont have signature this packer something like .arc who use many game packers like fitgirl nad other