[AthlonXP1800]

I attempted to install Windows 7 SP1 last night but it failed because one system component missing Windows 7 SP1 is required after ran CheckSUR:

C:\Windows\winsxs\x86_microsoft.windows.common-controls_6595b64144ccf1df_6.0.7600.20787_none_2b43 b51e45274037

Then I installed 7Zip to open Windows 7 ISO's install.wim image and went to winsxs folder to copy the missing folder but it wasnt there!!!

That is really very strange so I decided to install Windows 7 Ultimate on VMWare and install all 45 updates from Windows Update. Then I checked the winsxs folder to see if the folder is on VMWare and it not here either. I gave Windows SP1 installation a try on VMWare to see if it work but it successful installed SP1 on VMWare. How very odd!

I gave another try install SP1 on desktop PC but it still failed with same error so I reinstalled Windows 7 through Upgrade option and redownloaded all updates then installed SP1 went fine in the end. I found SP1 with Firefox and IE very smoothly without pauses when use lots of tabs or when used lots of memory.