I had the same exact problem...
I resolved by doing the following:
- Uninstalled .NET 2.0- Rebooted- Reinstalled .NET 2.0- Add/Remove Programs and chose "Repair" on NTA 2.0- Ran SolarWinds configuration wizard manually- Worked perfectly
This may be the same as a problem we've seen with a couple of users using Terminal Server.
The solution was to put the Windows into"install mode". Open a commandprompt and enter the command "change user /install". Once you're in install mode, restart theconfig wizard and everything should work. The Config Wizard will change the server back into "execute" modewhen it finishes.