Come on guys, show some smarts. "Reagan" didn't "win the Cold War." The United States did. In 1945, starting with George Kennan's The Sources of Soviet Conduct, the US engaged in a lengthy geopolitical economic, social, ideological and military struggle with the Soviet Union to convince the rest of the world one system was better than the other.
Unlike a shooting war, there was no clear winner by territory gained or battles won. Like a shooting war, it finally ended when one side was economically and politically exhausted.
The Soviet economy simply couldn't sustain the cost of the military buildup and managing their client states, because it was inefficient and not up to the task. The US certainly helped the collapse along by forcing the Soviets to spend money they didn't have on client states, on a space program, on the military and so on.
Of course, we were doing the same (to a lesser extent) as well, especially after 1980.
The Soviet Union would have collapsed regardless of whether Reagan or Walter Mondale was President.
Now, having said all that, and as a huge critic of his economic policies which began the debt crisis we face today, Reagan did a masterful job of managing the fall of the Soviet Union from the West's perspective. He trusted Gorbachev as a true reformer, and as a person, when almost no one else in the US did, and kept Haig and the hawks at bay when they wanted to take advantage of the disintegrating Soviet Union militarily - which could have been disasterous.
Much credit to Reagan in that regard. The collapse of the Soviet Union could have been extremely dangerous for the rest of the world. Instead, Reagan and Bush I handled it amazingly well. But cause it? No. They did not.