[PLUG] ubuntu installation through virtual box

[shailshinde24 at gmail.com]

I have windows as the host operating system and I have installed ubuntu  
8.04 on it as guest os using virtual box.
I have created a separate 8 gb drive for ubuntu .
But I cannot access the other drives which do not belong to ubuntu (eg  
C ,D,E,etc).
So what is the solution for it. ???
And also while installing the virtual box software on my windows ,it  
encountered a step saying this device has not passed windows logo testing.
I continued anyway . Is there any risk?