Invalid Newznab URL entered in windows 8

I cannot seem to get this working. I have used nzbdrone for a long time but I recently reinstalled windows 8 and I keep getting the above error. Here is the log output:

13-12-28 15:23:18.6|Warn|DownloadedEpisodesImportService|Drone Factory folder is not configured
13-12-28 15:23:31.4|Warn|FetchFeedService|http://www.nzbindex.nl/api?t=tvsearch&cat=5030,5040&extended=1 returned empty response.
13-12-28 15:23:31.5|Warn|NewznabTestService|Indexer doesn’t appear to be Newznab based
13-12-28 15:23:31.5|Warn|NzbDroneErrorPipeline|Invalid request Validation failed:
– Invalid Newznab URL entered
13-12-28 15:23:36.6|Warn|FetchFeedService|http://www.nzbindex.nl/api?t=tvsearch&cat=5030,5040&extended=1 returned empty response.
13-12-28 15:23:36.7|Warn|NewznabTestService|Indexer doesn’t appear to be Newznab based
13-12-28 15:23:36.7|Warn|NzbDroneErrorPipeline|Invalid request Validation failed:
– Invalid Newznab URL entered

This output happens with any indexer I try to use. I am not running as a service and I also have it running with admin privileges. I am also unable to connect to sab which is on my nas. I have also tried removing and reinstalling .net 4.5 framework, and disabling my firewall and avg.
Any help would be appreciated.
Regards
Alan

nzbindex isn’t a newznab based site. You will need to use one that is, such as nzbs.org, dognzb.cr, nzb.su or nmatrix.co.za (to name just a few).