I look through viewfinder and view is out of focus

The mju 140 is called the Stylus Zoom 140 in some parts of the world. You may download the manual here.

SLR cameras are meant to be used with the viewfinder, not live view. Live View on SLR's is a luxury that point and shoot users have come to expect, sadly. I suggest you start using the viewfinder and disregard the live view altogether, since it doesn't always give you an accurate representation of what the photo will turn out like, and it consumes battery power at a ridiculous rate.

No. You just rewound the film. The pictures you took are safe, but you probably 'lost' the rest of the film you did not shoot.

http://olympusamerica.com/cpg_section/cpg_support_manuals.asp?id=908

Here is the link to the Olympus website where you can download the user manual for the camera.

There's a small button next to the LCD screen that allows you to switch between LCD & viewfinder.

It does sound like a light leak, but hopefully all that has happened is that the foam seals surrounding the film compartment have perished and need replacing. With luck, this is unlikely to be expensive - check with your local camera shop or second hand camera dealer.

First you press the button called "MODE" and, without releasing it, press the "SET" button.
Then, the year will start to blink.
Set the year with the "SET" button. Once you finish setting the year, press the "MODE" button to change to the month.
Then, the same way with the month, day, hour, minutes.
After minutes, the display will stop blinking.
YOUR SET!

The mechanical link between Lens on V/F element has broken - Only Olympus will be able to do anything for you -check out the support site.

The D-450 Zoom is an improved version of the D-400 Zoom. Both models have the following features: •1.3 megapixel resolution •3x optical zoom lens - 2x digital telephoto •Stream-lined compact form design •Automatic focus, metering, and white balance •Built-in, pop-up electronic flash •Real-image optical viewfinder •LCD monitor •Buffered RAM memory; burst shooting •Video output to TV •12-second self-timer •8 meg SmartMedia included. Larger capacity cards available. In addition, the D-450 Zoom has the following features: •A larger buffered RAM memory permits rapid shooting (real-time shooting without having to wait for the image write) and a true sequence shooting in more quality modes: Memory Card Storage Capacity Shots Frames per second Quality Mode 10 2.0 SQ 8 0.8 HQ 4 0.8 SHQ •A new high-resolution glare-free LCD monitor screen that can be easily viewed at any angle and even in bright sunlight. The new monitor also uses less power •Automatic ISO adjustment from ISO 160 to 640. Manually selectable ISO 160, 320, and 640 •New Slow-Synchronization flash mode which enables the use of the flash on shots requiring long exposure (such as night time photography) •Image playback now includes an easier to use index mode of 4, 9, or 16 images. A 3x magnification inspection mode allows easy viewing of image detail •Overall power efficiency has been improved. 1.5 to 2 times more battery life compared to the D-400 Zoom •D-450 Zoom comes in a Champagne Gold finish NOTE: The D-450 Zoom digital camera does not include the Olympus FlashPath floppy disk adapter (which was included with the D-400 Zoom). The FlashPath adapter is available as a separate accessory.

The D-450 Zoom is an improved version of the D-400 Zoom. Both models have the following features: •1.3 megapixel resolution •3x optical zoom lens - 2x digital telephoto •Stream-lined compact form design •Automatic focus, metering, and white balance •Built-in, pop-up electronic flash •Real-image optical viewfinder •LCD monitor •Buffered RAM memory; burst shooting •Video output to TV •12-second self-timer •8 meg SmartMedia included. Larger capacity cards available. In addition, the D-450 Zoom has the following features: •A larger buffered RAM memory permits rapid shooting (real-time shooting without having to wait for the image write) and a true sequence shooting in more quality modes: Memory Card Storage Capacity Shots Frames per second Quality Mode 10 2.0 SQ 8 0.8 HQ 4 0.8 SHQ •A new high-resolution glare-free LCD monitor screen that can be easily viewed at any angle and even in bright sunlight. The new monitor also uses less power •Automatic ISO adjustment from ISO 160 to 640. Manually selectable ISO 160, 320, and 640 •New Slow-Synchronization flash mode which enables the use of the flash on shots requiring long exposure (such as night time photography) •Image playback now includes an easier to use index mode of 4, 9, or 16 images. A 3x magnification inspection mode allows easy viewing of image detail •Overall power efficiency has been improved. 1.5 to 2 times more battery life compared to the D-400 Zoom •D-450 Zoom comes in a Champagne Gold finish NOTE: The D-450 Zoom digital camera does not include the Olympus FlashPath floppy disk adapter (which was included with the D-400 Zoom). The FlashPath adapter is available as a separate accessory.