Unable to connect to internet in Vodafone Mobile.

Hello everybody,
I’m using this modem for a number of years. I’m running Windows XP Pro and my software all was up to date. The last version was V 3.2.1.156. I Have installed Windows 7 Pro 64 bit and also the modem functioned very well.
But I got trouble a week ago and then followed uninstall and re-install step for the software. I was unable to connect to the internet. I'm from South Africa, Vodafone is the main brand here and I took it to Vodacare. They tried fix it for hours. The laptop didn’t recognize the modem at some time. I told him to uninstall all from that modem and wanted to try it by myself.
At the time of installation, it still displayed error message.

'agent.exe.6ED28686_7B19_420C_B255_5B6C1BD2C7
05' is not marked for installation.
