XPCOM DLL register problem

[lfern]

Hello,
I have written a component to export a "clone" of SignText old function 
to javascript. On linux platform I have no problem, but when I compile 
in Windows I get the folowing debug info while registering:

  *** Registering "SECCLAB" components (all right -- a generic module!)
  nsGenericModule "SECCLAB": Register hook for CLABExtras component
       component returned error => 80004005
And here is the code:
......
static NS_METHOD
RegisterCLABExtras(nsIComponentManager *aCompMgr,
                  nsIFile *aPath,
                  const char *registryLocation,
                  const char *componentType,
                  const nsModuleComponentInfo *info)
{
  nsresult rv = NS_OK;
  nsCOMPtr<nsICategoryManager> catman =
    do_GetService(NS_CATEGORYMANAGER_CONTRACTID, &rv);
  if (NS_FAILED(rv))
    return rv;
....

When I call "do_GetService" it returns in rv NS_ERROR_FAILURE. I do not 
know what's happen because in linux it works!!!. Any help would be
greatly apreciated.