CyberTruth. BullGuard has just launch a new, free virus scanner for Windows PCs (Photo: BullGuard). SAN JOSE, CA -- If you use a Windows PC that's running slow and you suspect that it has been infected by malware, there's a new free tool you might want to try out.yberTruth. BullGuard has just launch a new, free virus scanner for Windows PCs (Photo: BullGuard). SAN JOSE, CA -- If you use a Windows PC that's running slow and you suspect that it has been infected by malware, there's a new free tool you might want to try out.