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@ElmerBeFuddled, .NET 3.5, and earlier, are part of Win 7, not a separate addon or install. Updates, when necessary, should also be included automatically by WU/MU without user intervention. So unless you do something specific yourself they should already be installed and active, I believe. .NET 4.0 is a separate install, and .NET 4.5, if used, should completely replace, or include, 4.0 and only 4.0. Other .NET frameworks will not be affected. As to why you still see the .4.0.3.319 folder, I haven't researched this so I'm guessing here, but I'm assuming that when 4.5 replaces 4.0 it either (1) continues to update 4.0 like 3.5 continued to update 3.0 and 2.0, or (2) puts hardlinks in the 4.0 folder, actually using the 4.5 files. The reason for doing either of these would be to handle poorly written software that checks for the availability of .NET by looking for specific files in specific folders. Bottom line, as a user, once you install 4.5 you don't have to worry anymore about updates for 4.0, you won't be offered them or see them as installed. @sp0ilesbrat, AFAIK all mention of any .NET greater than 3.5 regards to Win Toolkit has been by a user, not by the author Legolash2o. If any change is put in place to affect the use of Win Toolkit on XP I'm sure it will be announced and probably discussed in advance. Cheers and Regards