Try this... to cleanup some files from your computer that might be getting in the way:

In Internet Explorer go to the Tools menu and choose "Internet Options".
Press the "Delete Files" button. Check the "Delete all offline content" box and press "OK".
Next press the "Delete Cookies" button and press "OK".

Regarding deleting cookies.... cookies store information about websites you have visited. Sometimes people don't like deleting their cookies because they hold information important to them. For example, it could be that everytime you visit rcuniverse, you do not need to "log in" with your username and password... this is because the information is stored in a cookie. If you delete the cookie then you'll have to logon the next time you visit the site. It can cause some people great frustration when they delete their cookies if they do not know the username and passwords to the sites they like to visit. So, please keep this in mind before you delete your cookies.
With that in mind... cookies are most likely the reason you cannot access that website.

If you want to selectively delete specific cookies for specific websites, they are found by going to:
C:\Documents and Settings\YOURNAME\Cookies
where "YOURNAME" is replaced with the logon account you are using on that computer. If you never created a logon account, try looking in the folder for the user called "Administrator".