At http://windowsxp.mvps.org/ginadll.htm there is this article by one of Microsoft's MVPs. The article states (paraphrased):
Symptom
"When you attempt to turn on Fast User Switching or Welcome Screen, you may receive a message stating that a program used CSGina.dll ( or any other DLL ginamsi.dll etc ) to disable the Fast User Switching and the Windows Welcome screen features. The exact error message follows: A recently installed program has disabled the Welcome screen and Fast User Switching. To restore these features, you must uninstall the program. The following file name might help you identify the program that made the change:
[[User:71.233.106.135|71.233.106.135]] 14:40, 1 Aug 2007 (UTC)[[User:71.233.106.135|71.233.106.135]] 14:40, 1 Aug 2007 (UTC)[[User:71.233.106.135|71.233.106.135]] 14:40, 1 Aug 2007 (UTC)[[User:71.233.106.135|71.233.106.135]] 14:40, 1 Aug 2007 (UTC)[[User:71.233.106.135|71.233.106.135]] 14:40, 1 Aug 2007 (UTC)[[User:71.233.106.135|71.233.106.135]] 14:40, 1 Aug 2007 (UTC)[[User:71.233.106.135|71.233.106.135]] 14:40, 1 Aug 2007 (UTC)[[User:71.233.106.135|71.233.106.135]]
I just downloaded the ginadll.reg and it worked as described.
go into control panel to program and features, click in. then click clink on to view installed updates. scroll down until you see internet explorer 9 ,click on uninstall.
If your on windows goto the control panel -programs and features and uninstall it there.
Go to Control Panel>Program and Features Find HP Desktop and uninstall.
1. If you installed to 'try', but now do not want: go Programs and Features (Windows) in Control Panel select the program "Axis" - then select uninstall at top of page.
Programs and Features
The difference among different types of switching devices is in the features and the functions that they have. The two main types are packet switching and circuit switching devices.
Start>Control panel> Programs and features> look for Webroot> click "uninstall"
Just go to Control Panel>Program>Programs and Features> Right click the VLC media player and then choose Uninstall.
Click Start Click Control Panel Click Programs & Features Find the program in the list that you want to remove Right-click it and click on Uninstall
Press the start button, then Control Panel. Click Programs. Click Programs and Features. Select an icon. On the top menu, select Uninstall
To uninstall the farmville tool bar you need to go onto control panel, programs and features and then down to farmville toolbar. Right click it and then select uninstall. These instructions might only be able to be followed on windows.
1. Open Control Panel and then click "Uninstall a Program".2.Control Panel, use the Add or Remove Programs applet to uninstall programs , or click start, run write: appwiz.cpl