Try this on the Host and Client(s)
To modify the registry
CAUTION: We strongly recommend that you back up the system registry before making any changes. Incorrect changes to the registry could result in permanent data loss or corrupted files. Please ensure that you modify only the keys specified. Please read the document How to back up the Windows registry before proceeding.
1. Click Start.
2. Click Run.
3. In the Open box, type regedt32 and then click OK. The Registry Editor opens.
4. In the Registry Editor, navigate to the following key:
HKEY_LOCAL_MACHINESoftwareDelrina
If you are using Windows NT/2000, click Security and then click Permissions.
If using Windows XP, right-click the Delrina folder and then click Permissions.
The Permissions dialog box appears.
5. Select Administrators and users as needed, and then select the “Allow” box next to Read and Full Control.
6. Navigate to the following key:
HKEY_CURRENT_USERSoftwareDelrina
Repeat steps 4 and 5 while selecting the above key.
Exit the Registry Editor, and restart Windows.