I bought an OEM cd on ebay of Windows XP SP2. I partitioned the HD using bootcamp, then inserted the CD drive. It says that it is installed, but asks me to restart the computer. After it restarts, it boots from the CD again. But it tries to reinstall everything again. I reinstalled twice, and had to restart my computer 5 times. Twice, the computer froze up and said there was something wrong with the CD and said to press any key to restart. I pressed every key on my keyboard, nothing worked. I had to do a hard reboot twice. What am i doing wrong?