Q: I have videos it won't let me add to itunes, how can i fix this?

What format are the videos in?

Is it a format supported by iTunes? by the iDevice?

So what?
WMV and iTunes support different formats.

What format is the video(s) in?

What video content works with iTunes and mobile devices?

iTunes:

• Video content purchased from the iTunes Store.
• QuickTime and MPEG-4 movie files that end in ".mov", ".m4v", or ".mp4" and are playable in QuickTime Player.
• Video podcasts.
• iTunes Digital Copies.
• iTunes Store Movie Rentals (Requires iTunes 9 or later).

Mobile Devices:

• Video content purchased from the iTunes Store.
• Videos that have been shared to iTunes using QuickTime Player (Mac OS X v10.6 Snow Leopard).
• Videos that have been re-encoded for iPod with QuickTime 7 Pro.
• Videos that have been re-encoded for iPod with iMovie, Final Cut Pro, and others. Refer to Exporting a movie from iMovie HD to iPod for an iMovie HD tutorial.
• Video Podcasts that have been created for mobile devices.
• Video files after using the iTunes File > Create New Version > Create iPod or iPhone version option.
• Video files after using the iTunes File > Create New Version > Create iPad or AppleTV version option (iPad and AppleTV only).
• See below for detailed movie specifications.
• iTunes  Store Movie Rentals (Requires iTunes 9 or later).

Does the video need to be encoded in a special way?

All mobile devices which iTunes can sync video to can play the following video formats:

• H.264
  File formats: .m4v, .mp4, and .mov
  Video: Up to 768 kbits/sec, 320 x 240, 30 frames per second (fps), Baseline Profile up to Level 1.3.
  Audio: AAC-LC up to 160 kbits/sec, 48 Khz, and stereo audio.
• MPEG-4
  File formats: .m4v, .mp4, and .mov
  Video: Up to 2.5 Mbits/sec, 480 x 480, 30 fps, Simple Profile.
  Audio: AAC-LC up to 160 kbits/sec, 48 Khz, stereo audio.

Other formats may be supported by newer devices. The technical specifications can give additional details.