cable problems 6210

I hope someone can help me with my problem:

I want to unlock a 6210 and I have an original Nokia cable. When I try Rolis I get different error messages, like "com port busy" and "cannot initialize local mode".

Any ideas what the problem is?

When I use Nokia's PC suite I am able to syncronize to the windows address book, but strangely enough, the phone does not show up properly.

Thanks in advance for any advice.