Very little data for anyone to help... need DETAILS about your hardware and the files you are using
Most of these links are for Premiere Pro, but the IDEAS show the kind of information
Read Bill Hunt on a file type as WRAPPER http://forums.adobe.com/thread/440037
What is a CODEC... a Primer http://forums.adobe.com/thread/546811
What CODEC is INSIDE that file? http://forums.adobe.com/thread/440037
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Report back with the codec details of your file, use the programs below... a screen shot works well to SHOW people what you are doing
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For PC http://www.headbands.com/gspot/ or http://mediainfo.sourceforge.net/en
For Mac http://mediainfo.massanti.com/
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http://blogs.adobe.com/premiereprotraining/2011/02/red-yellow-and-gree n-render-bars.html
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Once you know exactly what it is you are editing, report back with that information... and your project setting, and if there is a red line above the video in the timeline, which indicates a mismatch between video and project
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More information needed for someone to help http://forums.adobe.com/thread/416679
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Some is general about your computer and OS, some is specific to video editing
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Build a Configuration file http://www.piriform.com/speccy
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Brand/Model Computer (or Brand/Model Motherboard if self-built)
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How much system memory you have installed, such as 2Gig or ???
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Operating System version, such as Win7 64bit Pro... or whatevevr
-including your security settings, such as are YOU the Administrator
-and have you tried to RIGHT click the program Icon and then select
-the Run as Administrator option (for Windows, not sure about Mac)
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Your Firewall settings and brand of anti-virus are you running
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Brand/Model graphics card, sush as ATI "xxxx" or nVidia "xxxx"
-or the brand/model graphics chip if on the motherboard
-and the exact driver version for the above graphics card/chip
-and how much video memory you have on your graphics card
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Brand/Model sound card, or sound "chip" name on Motherboard
-and the exact driver version for the above sound card/chip
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Size(s) and configuration of your hard drive(s)... example below
-and how much FREE space is available on each drive (in Windows
-you RIGHT click the drive letter while using Windows Explorer
-and then select the Properties option to see used/free space)
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Windows Indexing is BAD http://forums.adobe.com/thread/676303
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While in Properties, be sure you have drive indexing set OFF
-for the drive, and for all directories, to improve performance
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Some/Much of the above are available by going to the Windows
Control Panel and then the Hardware option (Win7 option name)
OR Control Panel--System--Hardware Tab--Device Manager for WinXP
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And the EXACT type and size of file that is causing you problems
-for pictures, that includes the camera used and the pixel dimensions
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Plus Video-Specific Information http://forums.adobe.com/thread/459220
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Read Bill Hunt on editing a VOB/MPG file http://forums.adobe.com/thread/464549
Edit Vob http://premierepro.wikia.com/wiki/FAQ:How_do_I_import_VOB_files_/_edit _a_DVD%3F
Read Hunt on Using MOD/TOD files http://forums.adobe.com/thread/699990
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Work through all of the steps (ideas) listed at http://forums.adobe.com/thread/459220
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If your problem isn't fixed after you follow all of the steps, report back with ALL OF THE DETAILS asked for in the FINALLY section at the troubleshooting link
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Also read file troubleshooting http://kb2.adobe.com/cps/407/kb407928.html
