I have a backup disc for the PoP: The Two thrones and I cannot get it to run on my computer. It installs fine and I can enter a disc key but when it goes to check the disc, it takes fifteen minutes to do so and then it just says there's a problem with my disc. Can anyone suggest a site where I can download a no-cd or backup-cd patch or maybe some other solutions that will allow me to play T2T, thanks.

Since it's not a freebie you're not going to find a legal download of it.

Here's UbiSoft's support page regarding getting a replacement disk:
http://ubisoft.custhelp.com/cgi-bin/ubisoft.cfg/php/enduser/std_adp.php?p_faqid=205&p_created=961794660&p_sid=udz2go2i&p_lva=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PWRmbHQmcF9ncmlkc29yd D0mcF9yb3dfY250PTEmcF9wcm9kcz0wJnBfY2F0cz0wJnBfcHY 9JnBfY3Y9JnBfc2VhcmNoX3R5cGU9YW5zd2Vycy5zZWFyY2hfb mwmcF9wYWdlPTEmcF9zZWFyY2hfdGV4dD1sb3N0IGRpc2s*&p_li=&p_topview=1