Windows 7 Network fails periodically

[gendoikari1]

I'm having a problem with the RC x64. My connection normally works, except that after a while, the connection starts doing weird things (Opera gets a connection problem error, the built-on Opera Mail function gives "Login failed" even though the web mail works fine, and Messenger gets a "Due to a connection problem, changes made on this computer cannot be made on other computers", or something like that). Restarting Opera and typing "regsvr32 softpub.dll" for Messenger only fixes the problem for a short amount of time. I have a wired internet connection on a Linksys WRT54G.
It only got these problems when the RC was installed (my other computer with Vista Home Premium x86 works fine).