2 Hard Drives, WinXP & Ubuntu, Can't access either from other

 I have 2 Hard Disks on my PC, 1 loaded with WinXP(ntfs), the other with Ubuntu 6.06. I also use a 3rd external Hard Drive (USB) and USB Flash cards. Windows and Ubuntu recognize everything BUT the hard drive that the other OS is installed on. Windows no longer even acknowledges the presence of the 2nd internal Hard Drive after I installed Ubuntu. My Ubuntu 'sees' my Windows Drive at least, but is unable to mount. I have determined that if I want to share any files from one drive to the other, I have to save it to one of my external drives then reboot into the other OS. Time consuming and agravating. I do not want to partition either drive unless absolutely nessissary (swap files???)

 How do I fix this? Mind you I am a total linux newby, I've been toying with the idea of abandoning Windows altogether for years but never had the courage till recently (Blue Screen of Death, Mal-ware, Viruses, Worms, etc...). I suffered a complete total system crash and ended up buying a new hard drive, motherboard & Processor (Core2Duo) and started over from scratch again, reinstalling Windows XP on my new hard drive. My old drive was still good so I reformated it and installed Ubuntu 6.06 on it, thinking that having each OS on it's own drive would reduce any conflicts, incompatabilities, or issues. And Ubuntu suprised the heck out of me too, but aside from accessing files from one to anther hard drive it has been a positive experience so far. Nearly all my files are on my XP drive, including my music collection (60Gbs & Counting) and I want to use them in Ubuntu.