Hello,

I tried the whole day just to import a cetrificate in winXP, but I allways failed. I did following:

1. Create the certificate with private key (no pasword):
   

   makecert -sr LocalMachine -ss My -pe -sky exchange -n "CN=TestCert" -a sha1 -sv TestCert.pvk TestCert.cer

2. Then put certificate and private key together into pfx file:
   

   pvk2pfx.exe -pvk TestCert.pvk -spc TestCert.cer -pfx TestCert.pfx

3. Import pfx file with commandline tool (German System):
   

   winhttpcertcfg.exe -i TestCert.pfx -a NT-AUTORITÄT\NETZWERKDIENST -c LOCAL_MACHINE\My
   Error:  Unable to import contents of PFX file.
       Please make sure the filename and path,
       as well as the password, are correct.

   Hint: "NT-AUTORITÄT\NETZWERKDIENST" --> "NT-AUTHORITY\NETWORKSERVICE"
   Filename is ok, password was not set. Even if I set the password (e.g. "MyPassword") in Step 1 and type at the end of step 3:
   

   ... -p MyPassword

   I got the same error. Then I tried to import in the certificate console (mmc with certificate snap-in). There i got following error: "Der private Schlüssel, den Sie importieren, erfordert möglicherweise einen Dienstanbieter, der nicht installiert ist." --> "The imported private key may requires a service-supplier which is not installed". But the Microsoft Crypto-Service is up and running.

What else can I do?
On Windows Vista and Windows 7 I got this running without these problems.
I need this Certificate to run a WCF Service.

Thanks in advance for any hint.

Regards,
Gunther