windows explorer slow

>-----Original Message-----
>If I right-click on a file (not an executable) when the
>computer is connected to the network, it can take up to 1
>minute for the drop-down box to appear.
>
>As soon as I disconnect, WinXp file explorer works fine.
>
>I have removed all shared drives, checked all users and
>groups. I am convinced that this is a network
>user 'rights' / and or security issue, but I have no idea
>how to fix it.
>
>Any help would be appreciated.
>
>Thanks
>.
>

windows explorer slow