It's not a problem with Ghost, but rather a permissions issue that your having. Symantec Knowledgebase tells you:
How to save images in a workgroup and avoid the "Access Denied" error
Situation:
Your goal is to save images in a workgroup. While attempting to save an image over the network, you see the error message "Access Denied."
 
Solution:
To properly save images over the network in a workgroup, perform the following steps:
 
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Note: Depending on the Norton Ghost, Drive Image, or V2i Protector view that is selected, Microsoft® Windows® XP users may find that the options, fields, and buttons mentioned in the following procedure may differ slightly from what they see on their system.
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Click an icon to either expand ( ) or collapse ( ) each section. (If you cannot expand a section, then read the document Cannot expand sections in a Symantec Knowledge Base document.)
Create a user account with Administrator privileges
 
Create a user account with Administrator privileges
On both the workgroup computer you are running Drive Image or V2i Protector on and the workgroup computer you want to save images to, create a new user account and give the account "Administrator" permissions.
 
 
To create an Administrator account in Windows XP Professional and Windows 2000 Professional
Right-click My Computer and click Manage.
Expand Local Users and Groups.
Click the Users folder.
On the Action menu, click New User.
In the User name, Password, and Confirm password fields, type the following:
 
v2i
 
Uncheck User must change password at next logon.
Check Password never expires.
Click Create.
Click Close.
Double-click the v2i user.
On the Member of tab, if the v2i user is not a member of the Administrators group, click Add, type Administrators in the "Enter the object names to select" field, click Check names, and then click OK.
Click OK to exit the Properties dialog box.
 
 
To create an Administrator account in Windows XP Home
On the Windows taskbar, click Start > Control Panel.
Double-click User Accounts.
Click Create a new account.
In the Account Name box, type the following:
 
v2i
 
Click Next.
Click Computer Administrator.
Click Create Account.
Click the v2i account.
Click Create a password.
In both the Type a new password box and the Confirm the password box, type the following:
 
v2i
 
Click Create Password.
 
Create a shared images folder
 
Create a shared images folder
Create a shared folder on the computer where you wish to store the image files.
 
To create a shared images folder
On the computer on which you want to store your images, double-click My Computer.
Double-click the local drive on which you want to store the images.
In Windows Explorer, on the File menu, click New > Folder.
Type a name for the new folder (for example, "Images") and press Enter.
Right-click the new folder, and then click Sharing (or Sharing and Security).
Check Share this folder.
Click Permissions.
Check Full (or Full Control).
Click OK to return to the new folder's Properties screen.
Click OK to return to Windows Explorer.
 
Technical Information:
This error occurs because the Norton Ghost or V2i Protector service cannot authenticate to the target computer (the computer on which the image will be stored).
 
I hope that helps