Windsor began his career in the back line, but soon moved to his position as hooker. He played for Brynglas, Cross Keys and especially Pontypool, where he trained with Graham Price and Charlie Faulkner, a legendary first number ( " Viet Gwent ' ), which was sung among others by singer Max Boyce. In addition to his career as a rugby player, he went after his work in a steel mill, which helped him in the crowd.
1973 Windsor first played for the Welsh national team, the opponent was Australia. In his debut, he also laid the single attempt of his career. Thanks to exceptional achievements, he was considered in the following year for the British and Irish Lions and traveled to South Africa, where the Lions selection became known as the " invincible " in the story. She lost throughout the tour a single game, the Springboks have won only a draw.
Together with Price and Faulkner played Windsor a major role in the success of Welsh in the 1970s. At the end of the decade, winning four times the Wales Five Nations Championship, including two times the Grand Slam. In 1977 he was again nominated for a tour of the Lions. He came in the first Test against the All Blacks used, but subsequently lost his place to Peter Wheeler. In 1979, he finished his career.
In 2005, doctors diagnosed prostate cancer at Windsor. Due to the depression resulting from this diagnosis broke his second marriage. His first wife had died as one of his daughters and one of his granddaughters from cancer. He has six children, 14 grandchildren and four great-grandchildren.