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cvpnd.exe. occupies 99% of CPU and remains in loop

Hi, I'm trying to solve the following problems:

1. After having to reformat C and reinstall all of XP and programmes, my VPN client (both versions 4.0.2. and 5.0 were tried) freezes my PC at "authenticating user" or "negotiating security policies". At best it slows down to an unworkable "speed" (read slowness). What can be the problem?

2. The slowness is probably due to Cisco's cvpnd.exe file that when trying to log in to the host occupies cpu for 99% and keeps on going (even "end process" via ctrl.alt.delete has no effect, it keeps on running).

I use Bullguard 7 for firewall, spyware, virus scans etc. and update every day. NOD32 also scans for viruses; and there are some spyware and adware scanners that never gave problems with VPN before reinstalling.

I tried (re)installing and running the VPN client software after closing all firewall's, virusscanners etc. To no avail. So it can hardly be a port being closed by the firewall; or has anyone ever heard of a provider closing ports for VPN clients-to-host traffic?

Thanks for any suggestion.

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