USB Modem no longer working on MacBook

I have been using my Virgin Broadband (Huawei E169) USB modem with my MacBook for the last twelve months. Apart from a huge hiccup when I upgraded to Snow Leopard it has worked flawlessly. Recently I had to restore my MacBook from my Time Capsule as it refused to boot up, and since then I've not been able to use my USB wireless modem. It works fine on my iMac and on my Son's PC Dell Laptop.
When I try to connect, I either get a message that says 'unable to connect to PPP server' or I the 'auto open' closes immediately and I get a huge error report. I have copied the report if anyone is interested, I'll include it on a future post.
I've rung my ISP and Apple Care and have had no success. I've tried a friend's USB modem, and was unable to get it to connect, I also tried mine on her MacBook and got the same errors as on my MacBook.
At this point, I have also checked that I have the latest Mobile Connect and the latest firmware, and have compared files with those on my iMac, and I cannot find the discrepancy. I still don't know whether my MacBook is at fault of the USB device itself. I am loathe to buy a new USB modem, until I know for sure. I don't know what to try next though.
Thank you.

The irony of this problem is that I solved it using a post from here which I'd copied from Whirlpool last year. I'd gone through every solution taht I could find, several times over an in the end used this one which worked perfectly. It was actually my last resort, I'd run out of options. Thought I'd best post back here, just in case someone else has an issue.
This post was found @ www.whirlpoo.net.au by Designed. The OP posted this solution
Thought this was important and needed to be posted here too. I'm up and running again, and very very happy
The solution I found to work is :
1. Open up Terminal.
2. Become root using sudo -i (using your user account password when prompted)
3. Paste the following command in: echo "refuse-chap\nrefuse-mschap\nrefuse-mschap-v2" >> /etc/ppp/options
Next Step
Plug in the device, when the disk image mounts, right click on the app and choose 'show package contents'
Navigate through contents -> resources -> and run the MobileConnect_DrvApp.pkg
Reboot
Then in system prefs -> network
you will see HUAWEI Mobile (not connected)
Add the following settings
telephone number : *99#
account name : VirginBroadBand
password : VirginBroadBand
TICKED Show Modem status in menu bar
I didn't have to change any advanced settings, but to confim them
(In Advanaced Settings)
Vendor : Generic
Model : Dialup Device
TICKED Enable Error correction and comptession in modem
Dial Mode: Wait for dial tone before dialing
Dialing TICKED Tone
Sound TICKED On
Now I connect via the icon in the status menu
Thanks to the following sources of info:
/forum-replies.cfm?t=1270696#r10
http://discussions.apple.com/thread.jspa?messageID=10071673&#10071673

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