virtualbox.org

I'm using Virtualbox 4.2.10 with Ubuntu Precise 64 bit as host. I have a guest Windows XP with dynamically allocated 10GB. I foolishly installed .Net & storage is now full & Windows XP is running slow. How do I increase size of storage to say 12GB?

Thanks, Perryg. It worked fine. I used AOMEI Partition Assistant within Windows XP to increase the size of the partition.