Why?

AVware DownloadAdmin (fs) 20150212
Agnitum Riskware.Agent! 20150211
Avira APPL/DownAdmin.prfa 20150212
ByteHero Trojan.Win32.Atraps.b 20150212
DrWeb Trojan.DownLoader12.23360 20150212
ESET-NOD32 a variant of Win32/DownloadAdmin.I potentially unwanted 20150212
Ikarus PUA.DownloadAdmin 20150212
K7AntiVirus Trojan ( 004b53031 ) 20150211
K7GW Trojan ( 004b53031 ) 20150212
Sophos Mal/ZboCheMan-N 20150212
VIPRE DownloadAdmin (fs) 20150212
ALYac  20150212
AVG  20150212
Ad-Aware  20150212
AegisLab  20150212
AhnLab-V3  20150211
Alibaba  20150212
Antiy-AVL  20150212
Avast  20150212
Baidu-International  20150211
BitDefender  20150212
Bkav  20150212
CAT-QuickHeal  20150211
CMC  20150211
ClamAV  20150211
Comodo  20150212
Cyren  20150212
Emsisoft  20150212
F-Prot  20150212
F-Secure  20150212
Fortinet  20150212
GData  20150212
Jiangmin  20150210
Kaspersky  20150212
Kingsoft  20150212
Malwarebytes  20150212
McAfee  20150212
McAfee-GW-Edition  20150211
MicroWorld-eScan  20150212
Microsoft  20150212
NANO-Antivirus  20150212
Norman  20150211
Panda  20150211
Qihoo-360  20150212
Rising  20150211
SUPERAntiSpyware  20150212
Symantec  20150212
Tencent  20150212
TheHacker  20150212
TotalDefense  20150212
TrendMicro  20150212
TrendMicro-HouseCall  20150212
VBA32  20150211
ViRobot  20150212
Zillya  20150211
Zoner  20150211
nProtect 
why does it show it has virus/malware and or trojans when i scan it

False positive: https://www.horizonmb.com/threads/156651-Horizon-Virus?p=1340546#post1340546

Many threads like this have been made.

It is a false positive like Gengar said, but if you still feel unsure about downloading from the homepage download link, you can download just the client itself from the link below.

https://www.horizonmb.com/client/v2/latest.php