The problem is with a device at one of the locations in the send to folder. This usually happens with some slow response device such as a floppy drive, but almost never for 90 seconds. It sounds to me like one of your devices is malfunctioning. Let me explain.
When you open the "Send To" on the right click menu for a file, it contains a list of locations (commonly things like Desktop, C: drive, Shared Documents, Floppy Drive, etc). This list can contain various locations depending on your configuration. As part of the display operation for the menu, windows attempts to obtain an icon for the device. The devices icon is determined by what media currently resides in the device (IE a cd may have it's own icon, as sometimes may a floppy disk). When windows queries the status of the device, it is responding slowly, inapropriately, or not at all, causing windows to stop working while it waits for a response from the device.
What are the storage devices attached to your system? This includes USB storage locations and CD drives, as well as devices that you may have to access over the network.