Thanks for trying MedClaim for Windows! Registration is only $49. If you do register, I will send you the most recent version of MedClaim for Windows and put you on the mailing list as a registered user. Every 6 months I will mail you a letter when the next revision of MedClaim is available and you have the option of upgrading for 1/2 price, or $25. Lastly, during installation the program will exit to DOS in order to decompress some files. After this, the program will reenter windows and continue operations. Thanks Franklin Leibsly