Microsoft has released the first service pack (Final release) for Windows 7. It is a collection of all previous updates. It is also includes client side support for RemoteFX and Dynamic Memory for Windows 7 VMs. Windows 7 and Windows Server 2008 R2 SP1 helps keep your PCs and servers on the latest support level. Both 64 bit and 32 bit service pack size is about 1GB. If you are facing any problem after installing service pack, you can uninstall it completely. Find this article about How to Uninstall Windows 7 Service Pack 1
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