i bought myst 4 at walmart and with the trouble i had installing it i scatched one disk and now i want to replace them....i saw somewhere for 10.00 i can....what is the address?? and do you think they will replace them???? thanks JT

Will they replace them? Who knows, but maybe you'll get lucky!

Here's the official return or replacement policy from the Ubisoft Solution Center's Q&A:

Q. I Need replacement for lost or damaged Game CD or Manual.

A. Please contact Ubi Soft Technical Support before sending your product to us.
In many cases, a replacement is not the best solution. Our support representatives will help you determine if a replacement is necessary or available. You will need to first acquire an RMA (Return Materials Authorization) number to process your return or replacement. Without an RMA number from a support representative, your replacement request will not be processed. Please click here or call (919) 460-9778 to contact a support representative.

If we determine a return or replacement is necessary:

Within the 90-day warranty period:
Please return the product (media only) along with a copy of the original sales receipt, showing the date of purchase, a brief description of the difficulty you are experiencing including your name, address(No PO Boxes), RMA and phone number to the address below. If the product was damaged through misuse or accident (cracks, scratches), or if you do not have a dated sales receipt, then this 90-day warranty is rendered void and you will need to follow the instructions for returns after the 90-day warranty period.

After the 90-day warranty period:
Please return the product (media only) along with a check or money order for the amount corresponding to your product (see replacement fees below) made payable to Ubi Soft, a brief description of the difficulty you are experiencing including your name, address(No PO Boxes), RMA number and phone number to the address below.

Replacement Fees
Important! Be sure to read the above policy before sending anything to Ubi Soft Technical Support!

All CD Game replacements (PC, MAC,
Playstation, Xbox, Gamecube)..........................$10 ea.

Xbox 360 game replacements...........................$15 ea.

GameBoy Advance, N64 Cartridge replacements...$15 ea.

GameBoy Color Cartridge replacement.................$10 ea.

All manuals or reference cards...........................$5 ea.

CD Keys.........................................................$5 ea.

Warranty Address and Contact Information

Phone: 919-460-9778
Hours: 9am – 9pm (EST), M-F

Address:
Ubi Soft Replacements
3200 Gateway Centre Blvd, Ste 100
Morrisville, NC 27560

Please use a traceable delivery method when sending products to Ubi Soft.