Digital certificates

[Kennyangel]

I have recieved a digital certificate from accreditation scheme to get onto a goverment website relative to my business. after following the instructions i successfully downloaded the key with the correct password however when i go to "authorised users" on the website a screen comes up asking me to choose which digital certificate i want to use but no certificates are shown and when i press ok internet explorer just comes up web page not found. the screen does not allow me to browse or input anything either. I have taken it to a local computer guy who after fiddling with it for a couple of hours told me he couldn't find the problem. I also emailed the company who sent me the key who then sent me another one which also did not make any difference. can you help or advise me please.
Regards Ken

[bilbus]

you need to install it first.

http://www.microsoft.com/technet/pro.../c06ie6rk.mspx

[Kennyangel]

I have installed it as it shows up in internet options under personal certificates and it is in date upto April 2009