Trojan Horse Proxy.AMXD

A computer I sometimes use for work in a satelite office has to Threats that are being blocked constantly:

 

Trojan Horse Proxy.AMXD

Exploit Blackhole Exploit Kit

 

Its says that its source file is contaminated:

 

Windows\System32\suchost.exe

 

That tells me that the computer is infected but maybe the virus is isolated to those files.

 

I cannot find any information on these threats in any of the libraries.  Does anyone know what these are?  How can I get them off the Windows\System files?