Error

[ddouglass]

Try uninstalling 3.21, delete everything in the Hoster folder under Program Files, then you will need to delete the registry entries for Hoster.

Fix: Delete Hoster's Persistence Registry Keys.

1. Left click the Start Menu and click Run.
2. Type in regedit and click OK or Open.
3. Go to the very top of the Registry Editor. It you already see the Registry Keys expanded below, skip this step and go to the next step. Click the + beside My Computer.
4. Click the + Beside HKEY_CURRENT_USER
5. Click the + beside SOFTWARE
6. Click the + beside Micro Technology Unlimited
7. Click the + beside Hoster
8. Click Default to select it. WARNING! Be VERY careful to have this exact location selected. If not and you proceed, you could damage your Windows installation, requiring it to be re-installed to fix it. BE VERY CAREFUL! With Default selected, press the Delete Key Click Yes when it asks you if you are sure.
9. Click the X in the Top Right corner to close the Registry Editor.

After that re-install Hoster.
What the error is saying is that theprogram does not have the correct settings to access the database.

This is why you should keep copies of the previous versions installer file. WHen you download click SAVE instead of RUN, then install it from your location you saved it.

I am wondering why you didn't update to 4.11 to see if it would fix your problem with 4.10?