See: http://urlquery.net/report.php?id=7080691
and https://www.virustotal.com/nl/url/e2e76e39a156498350dae3960e95070b208fb2c0718e6cb9b53eeed69cffc38c/analysis/1382528522/
and https://www.virustotal.com/nl/file/6274386c85532c1b4eec32a742f71b1ddc233f6adad8a7547aadacac381d298c/analysis/1382528529/
100% possibility of it being a virus: http://f.virscan.org/KWMusicNoAD.exe.html
For all of the "goodies’ there, live and already closed or dead: http://lists.clean-mx.com/pipermail/viruswatch/20131023/107396.html
So this is strange: http://www.quttera.com/#online url malware scanner
3 detect at urlvoid: http://www.urlvoid.com/scan/dx7.52z.com/
see part of what has been recently spread from that IP
2013-10-23 12:01:57 htxp://dx7.52z.com/WindowsUACManager.exe 58F65EDE0DD882334B8AD4F6DB572B12 61.187.182.21 CN Win32/TrojanDownloader.Agent.RRR trojan
2013-10-23 11:50:41 htxp://dx7.52z.com/WindowsXpST.exe 65B2F2B9638B4C6968676B9094C0D0CF 61.187.182.21 CN Win32/TrojanDownloader.Agent.RRR trojan
2013-10-23 10:08:12 htxp://dx3.52z.com/jmtv_mini.exe B52063332CC522C943B0D28CFC5A4006 61.187.182.21 CN Win32/GMUnpackerInstaller.B potentially unwanted application
2013-10-23 10:06:47 htxp://dx7.52z.com/QQshuap.exe 28B52107A917B73B6D927FF0D84ACBDD 61.187.182.21 CN Win32/FlyStudio potentially unwanted application
2013-10-23 09:58:47 htxp://dx7.52z.com/WIM_YIJanzh.zip 381F066F7B93777196ADBB3ACDC69D5C 61.187.182.21 CN W32/Trojan2.NVGH
2013-10-23 09:58:23 htxp://dx7.52z.com/WINRARToPictur.exe 0DF56EB52D714AC301E336D3A83A6E6F 61.187.182.21 CN Win32/PSW.Agent.NTJ trojan
2013-10-23 09:05:57 htxp://dx7.52z.com/WclockInst_en.exe 6617513D8E68695C57E01F2EDC228DC0 61.187.182.21 CN Mal/Generic-L
2013-10-23 08:05:57 htxp://dx7.52z.com/WLSH.exe 4F532EA33EF6CC2F4E7A74026CC6EAF2 61.187.182.21 CN W32/Backdoor2.ELZD
2013-10-23 07:14:34 htxp://dx4.52z.com/yyhd.exe 24A7B16C3B1E95E11ABDC8EA721643EA 61.187.182.21 CN Win32/TrojanDownloader.Dadobra.NDM trojan

I hope that IP is being blocked alltogether,and it is not, see: index of htxp://61.187.182.21/ and all the undesirables there!
See: http://support.clean-mx.de/clean-mx/viruses.php?ip=61.187.182.21&sort=id%20DESC (various malcode up and alive)
example that avast misses: https://www.virustotal.com/nl/file/4b815b93c90b5f8be83257d50a4334c1d95db10008ff70dbd6324f26a09a8c6f/analysis/

polonus