Hi Fairhsa,
Unfortunately we cannot offer any specific support on this modem, as it is not a Vodafone UK one - however, the error message you're getting is most commonly caused by a conflict with existing software on the PC, which takes hold of the modem before VMC can.
To troubleshoot this I would suggest starting the PC in Clean Startup mode, which will confirm if this is a software conflict issue.
The attached document has all the instructions you need
Jon
eForum Team