One or more problems were detected with your Drupal installation

I downloaded the Drupal software application and installed it on my Windows Vista machine. After installation, I had a welcome screen, I went to create a login account, which worked fine. I created that as an admin account, as per instructions. I did a few configuration changes, according to my need. Later when I go to the admin section, I get a pop up message as below:
One or more problems were detected with your Drupal installation. Check the status report for more information.
And the status report does not come up with information. Do I need to uninstall it and reinstall it again, or can I do something to fix this up?
