應該是, 先裝3.5再裝sp1, 順便提醒一下, 裝完以后要馬上安裝一個update from microsoft: IMPORTANT: After installing the .NET Framework 3.5 SP1 package (either the bootstrapper or the full package) you should immediately install the update KB959209 to address a set of known application compatibility issues. In addition, on Windows Vista x64 and Windows Server 2008 x64, install the update KB967190 to address a file association issue for XPS documents.
from microsoft:
IMPORTANT: After installing the .NET Framework 3.5 SP1 package (either the bootstrapper or the full package) you should immediately install the update KB959209 to address a set of known application compatibility issues.
In addition, on Windows Vista x64 and Windows Server 2008 x64, install the update KB967190 to address a file association issue for XPS documents.