I am running Home/NTFS - so I have never done this before - but here is how it is supposed to be done:
Windows XP Professional Using the NTFS File System on a Domain
Click Start , and then click My Computer
On the Tools menu, click Folder Options
On the View tab, click Show hidden files and folders
Clear the Hide protected operating system files (Recommended) check box
Click Yes when you are prompted to confirm the change
Click OK
Right-click the System Volume Information folder in the root folder, and then click Sharing and Security
Click the Security tab
Click Add , and then type the name of the user to whom you want to give access to the folder. Choose the account location if appropriate (either local or from the domain). Typically, this is the account with which you are logged on. Click OK , and then click OK
Windows XP Professional using the NTFS File System on a Workgroup
Click Start , and then click My Computer
On the Tools menu, click Folder Options
On the View tab, click Show hidden files and folders
Clear the Hide protected operating system files (Recommended) check box. Click Yes when you are prompted to confirm the change
Clear the Use simple file sharing (Recommended) check box
Click OK
Right-click the System Volume Information folder in the root folder, and then click Sharing and Security
Click the Security tab
Click Add , and then type the name of the user to whom you want to give access to the folder. Typically, this is the account with which you are logged on. Click OK , and then click OK
Hopefully you'll see it and can run a virus scan on it!
Let me know if you get there as I have heard folks have problems with this. Maybe someone who is running Pro/NTFS could be of some help if it doesn't get you there!