Hello cynthiaify, be sure you have the latest Java installed

check it : http://www.java.com/en/download/installed.jsp

http://www.java.com/en/download/manual.jsp

and you need to accept a warning when you click the download button in keepvid website

also KeepVid support the next sites ONLY: youtube, Dailymotion, 4shared, 5min, 9you, AlterVideo.net, Aniboom, blip.tv, Break, Clipfish.de, Clipser, Clip.vn, CollegeHumor, Cracked, Current, dekhona.com, DivxStage.eu, eHow, eBaumsWorld, Ensonhaber, Facebook, Flickr, Flukiest, FunnyJunk, FunnyOrDie, FunnyPlace.org, Metacafe, MySpace, Ning, Photobucket, RuTube, SoundCloud, Stagevu, TED, Tudou, TwitVid, VBOX7, videobb, VideoWeed.es, Veoh, Vimeo, zShare.net.

thank you

i have installed java 7 update 25 then also it was not loading java applets for my system.plz check it once iam forwarding a snapshot of that issue and if you have any idea plz reply me.

Try the Java test links and troubleshooting suggestions here:

• Use the Java plugin to view interactive content on websites
• http://kb.mozillazine.org/Java

thanks guys, u ve provided a lot of useful info. M goin to get to them and let u know which has been most useful.