I have a Lenovo S10-3t, which came with Windows 7 Home Basic installed. I bought an anytime upgrade to Home Premium. I started the upgrade, but it said that I must first activate System Restore. The system restore configuration menu had two Drives C:\ with one labelled "missing". I disabled restore on it and this drive disappeared; the other one then had restore switched on automatically, so I proceeded with the installation. After about 10 minutes, I got the message that the upgrade was not successful. After clicking close, I restarted the system. It said that it was upgrading. Once it rebooted, it upgraded further, and then rebooted again. Finally, it booted into Home Premium's welcome screen.
The system properties shows that it is indeed Home Premium. Aero and Tablet Input are working fine.
Has it happened with someone else? Do I need to worry about the system being broken in any way?