Internet explorer advice

[Monsieur]

Explorere is working fine, but everytime my son tries to access runescape.com and play some games explorer vanishes.
Every other web page works okay and this particular site was working fine until last night.
Any advice?
Thanks in advance.

 

[centaur]

The site works fine for me. I'd suggest a first move of clearing the cache. Is the A/V and anti spyware protection up to date and been run ?