how can i fix this problem

Faulting application name: DllHost.exe, version: 6.1.7600.16385, time stamp: 0x4a5bc6b7
Faulting module name: RPCRT4.dll, version: 6.1.7601.17514, time stamp: 0x4ce7ba59
Exception code: 0xc0020043
Fault offset: 0x0005cd99
Faulting process id: 0xbcc
Faulting application start time: 0x01cdaab15d915577
Faulting application path: C:\Windows\SysWOW64\DllHost.exe
Faulting module path: C:\Windows\syswow64\RPCRT4.dll
Report Id: 9b4765d8-16a4-11e2-a475-bc5ff4560677

keeps popping up all the time

help me please