.net framework ?在microsoft的官方网站就有下啊http://www.microsoft.com/downloads/results.aspx?NextOrPrevClause=1%7c-722&productID=&CategoryID=&freetext=.NET+Framework&DisplayLang=zh-cn&DisplayEnglishAlso=&sortCriteria=popularity&startDate=&period=0&type=&sortOrder=ascending&nr=20
微软中国下载