I have just finished installing Service Pack 1 on a test machine and all went fine. I have included images as you can see. I started the process at 10:13AM PST and the installation completed at 12:03PM PST. Configuration restarting and preparing Service Pack 1 did however take a bit longer as reflected in the screen captures included.
The test machine is a Comaq 6029US x86 with an AMD 2100+ 1.73 GHz processor, and 1GB DDR Ram.
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(http://i51.tinypic.com/20pehjm.jpg)
(http://i55.tinypic.com/5yc9a9.jpg)
(http://i56.tinypic.com/202jxd.jpg)
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(http://i54.tinypic.com/nc0fac.jpg)
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(http://i55.tinypic.com/51a643.jpg)
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taken with digital camera after restart
(http://i52.tinypic.com/21aygc8.jpg)
(http://i52.tinypic.com/34yvgp2.jpg)
back to screen captures
(http://i52.tinypic.com/1z1b6rk.jpg)
(http://i56.tinypic.com/swbzib.jpg)
(http://i51.tinypic.com/2hh3kpd.jpg)
The images are the size they are to show details and Date and Time:
Installed Service Pack 1 (windows6.1-KB976932-X64) on my Hp dv8t Quad Edition and all went well. However I expected nothing less...very smooth operation.
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(http://i53.tinypic.com/2nu0xvs.jpg)