I am getting this error on IE 8 ,9 firefox and chrome. while editing content in WebSphere Portal 7.
IWKAP0010W: An applet failed to load or is unavailable. Certain Web Content Management features will not be available.
Is there any way to solve this.
This seems like there is no Java plug-in (since you mention IE8 also gives you this error) on the system you are using to access WCM authoring. Newer, auto-updating browsers such as Firefox and Chrome tend to block all but the absolute latest Oracle Java plug-in for security reasons. However, typically there is a prompt to "allow this time." IE8 doesn't do this, but you'll get the same error message from WCM (IWKAP0010W) if you have no Java plug-in installed.
There are a couple of ways you could resolve this:
Usually the easiest is to just install Java on the authoring computer. If that's not an option (for example you don't have installation permission), you could change your content system to no longer require Java applets for editing.