My disk space is low on my virtual machine

Hey there,
My question requires some expertise in Virtual Machine administration and navigation. I am using a Windows XP machine in a virtual machine environment as the robot we are running can only run faster using it. The robot at I am mentioning here is an Excel file with macros in it that runs automatically when the items or cells are entered with data. Together with the robot, we are using Microsoft Outlook to send the data.
We are only given 250 MB user disk space since all our stuffs will be saved in a shared drive. I was just wondering. I made sure that all of my files are already deleted, as well as in recycle bin. But, it still says that my memory is low. I also performed disk clean up, but it is just the same issue. How do I find out if there are still files under my profile? Thanks.
