title: inno setup regsvr32 fails
body: <p>i have a DLL with COM interface and like to install it with Inno Setup 5.5
  but Inno Setup fails with regsvr32 with code 0x5. Generally this should point
  to a privileges issue.</p>
  
  <p>Using manually regsvr32 in an admin console, the DLL/COM gets registered without eorrs and i can see the typelibrary with OleView.</p>
  
  <p>It just fails with Inno Setup. </p>
  
  <pre><code>  source\my.dll"; DestDir: "{sys}"; Check: IsWin64; Flags: ignoreversion  regserver 64bit; 
  
  source\my.dll"; DestDir: "{syswow64}";  Check: IsWin64; Flags: ignoreversion  regserver  32bit
  </code></pre>
  
  <p>Some other parameter should make sure to start install with admin privileges:</p>
  
  <pre><code>PrivilegesRequired=admin
  ArchitecturesAllowed=x86 x64
  ArchitecturesInstallIn64BitMode=x64
  </code></pre>
  
  <p>Anyone has an idea what's wrong ?
  Thank you</p>