I am using an official (and registered) version of XP Pro. I recently unsucessfully tried to install XP SP1. I get the error message "Could not verify the integrity of the file Update.Inf make sure Cryptographic service is running on this computer". I have checked and this service is running. How can I resolve this problem as I need Sp1 to run USB2 on this system.
Try going to Admin Tools ... Services and Set Cryptographic Services to Disabled. Reboot into Safe Mode and using Windows Explorer navigate to c:\Windows\system32\catroot2 and rename it oldcatroot2. Reboot to Windows and Enable Cryptographic Services. At the command prompt, type the following command
net start cryptsvc
Try SP1 again
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