If you move the content folder(s) you are using you need to go to Edit>Preferences>Directories

When you open that tab you will see the list of DAZ Studio content folders, if any - assuming there's one there, and it's on the wrong drive now, highlight it and click remove. Now click Add and select the new location (for a DS folder you want the folder that contains the Data and Runtiem folders).

Now, near the top of the dialogue, just under the row of tabs, there's a long button labelled DAZ Studio content directories: click that and select Poser content directories from the menu. Again, you should see a list of folders with at least one entry (the Content folder in the original DAZ Studio folder). For any that have been moved, highlight, click Remove; then click Add and select the new location of the folder (you want the folder that holds the Runtime folder). Click Accept and that should be it.