Mac grey/reboot screen when surfing

[MrMacintoch]

Hello all,
Newb here.
I have had a 09 macbook 10.6.4 osx dual intel for the last year with no problems. Just in the last week I have gotten a usb broadband modem (of which I have used similar devices on this machine w/o problems) and been surfing, and downloading... And now I get the grey reboot screen intermittently it seems to happen while using firefox and gmail. I figured to update everything and i thought it was finished. But it still crashed. I have downloaded ClamXav and have no known virus. Now I have switched to Safari and so far *fingers crossed* haven't crashed since. 30 mins so far... Any help, comments, concerns...
If it happens again im this close to wiping the HD...

 

[spinnerlys]

It's a Kernel Panic, if the following message appears on your screen:

About "You need to restart your computer" (kernel panic) messages

Resolving Kernel Panics

What happens, if you use another modem? Or have you added any other hardware to your system? Does the modem come with drivers? How is it connected?

Btw, it is not a virus or malware.

Mac Virus/Malware Info

 

[MrMacintoch]

yea thats the screen.
its a usb interface its basically a thumb drive with sim card inside http://www.celcom.com.my/broadband/html/extra.html#
the drivers are installed the first time you plug in the devise to the usb port.

Side note no crashes since i switched to safari. 2 hrs so far.