turn on the computer this morning to find tips online update system to download a patch , opened it, turned out to be Windows XP SP3. That Sp3 RTM before I have concerns about , and then the official version came out in a simplified Chinese attitude of wait and see , I did not install. In fact, not fear of system instability , but after the installation to see many students taking up nearly reflect the 800M hard disk space. 
 
 Since the online upgrade has begun to suggest ,
Microsoft Office 2010 Pro Plus, I think it would install it,
Office 2010 Download, after all, Windows is not patched is more horrible. However,
Office Home And Stude/nt 2010 Key, as online upgrade too slow , I went to the Microsoft Download Center to download the XP SP3 Simplified Chinese version of the ISO package.  Download : Windows XP Service Pack 3 - ISO-9660 CD image file 
 
 said the following about how to make the installation does not account for too much hard disk space :  1. not directly double-click the WindowsXP-KB835935 -SP2-CHS.exe installation, but with cmd into the command line, run  WindowsXP-KB835935-SP2-CHS.exe-n  so that you can not back up the old installation files , but the drawback is to upgrade fails Can not return to a previous state , but low probability .  2. the installation is complete ,
Windows 7 sale, you can clear the Windows system folder, some of the following directories and files. I deleted these :  C:  WINDOWS  $ NtServicePackUninstall $ backup before the update of the old file  C:  WINDOWS  ServicePackFiles backup SP3 new file  C:  WINDOWS  $ hf_mig $ ( this is hidden Folder) or the folder with the files left -ie7 ,
Microsoft Office Pro 2007, remove the remaining documents , retaining the folder  C:  WINDOWS  SoftwareDistribution  Download  C:  WINDOWS  Installer  $ PatchCache $  C:  WINDOWS  Driver Cache  i386  sp2.cab 
 3. done! On Photo :