I currently own a G1S bought from Taiwan and it was preinstalled with Microsoft Office 2007 trial. A few days ago I bought Office Home and Student 2007 and went back home to install on it. That was when Avast prompted me to install the new version. And I did but I didn't restart my laptop just yet. I went on to uninstall Office 2007 trial and Activation Assistant for Microsoft Office 2007 suites. Then I restart my laptop. As what this topic is about, windows didn't start up and there was only just a black screen with the mouse cursor. So I restarted my laptop again, went into safe mode and system restore to the day before I update Avast. (after I found out that it was caused by Avast's new version having conflict with some Asus softwares.)
After system restore, Avast prompted me to restart my laptop for the new version to take effect. I didn't and went on to uninstall Avast, Office 2007 trial and it's Activation Assistant. I was unable to uninstall Office trial and it's Activation Assistant with an error which I assume some files were missing when I was uninstalling them before system restore. This kind of little things bugs me and as you can see here, there's nothing I can do about it because if I system restore back to the day I bought my Office Home and Student 2007 edition, naturally my Windows will not even start up.
So I decided to do a clean install with it's recovery disk. As usual, there will be a lot of bloatware installed. Did some search and came across this forum
http://forum.notebookreview.com/showthread.php?t=141156&highlight=g1s+bloatware. As far as I can remember, I uninstalled Check Mail, Power Phone, Symantic AV Suite, ASUS LiveUpdate, Net4Switch, Multiframe and Data security Manager. Also installed Avast previous version as suggested by Vlk.
Just got back home today and check here to see if there's any progress on this problem. Saw that the problem seems to be caused by Data security Manager. Since I have it uninstalled already, I decide to give it a go again updating Avast to the latest version. Restarted my laptop and windows started up normally.
Sorry for my long story but I hope it helps.