Hi,
I would suggest to check the followings:
-Enable Java and Javascript on the browser
-Disable pop blockers on the PC
-Disable unsupported Java Plugg-ins
-Make http is enabled on the router
-Ensure that the pc is not blocked by ACL
FYI:
Supporterd browsers: IE 5.5 and above, Netscape 4.79
Java Plug-inns: Built in browser JVM, JRE 1.3.1 or 1.4.1 <--You can verify this by going into "Add-remove Programs". If you don't have the JRE, can download from www.sun.com
Thanks,
Mynul