Use
Windows Update to install and fully update the .Net Framework v1.1. (Install it, reboot if it wants you to, and check windows update again for patches or hotfixes. Keep checking until nothing else is listed. Take the opportunity to check for other patches, I'd recommend installing everything except driver updates unless the specified device has been having trouble in which case install the new drivers too)
In rare instances, the .Net Framework will not properly install, although
Windows Update thinks it has and won't let you install it again. You can use Add/Remove from the Control Panel to uninstall it (It's called Microsoft .NET Framework, also remove any associated hotfixes) and reinstall it through
Windows Update (preferred option) or get the
.Net Framework package directly from Microsoft through this link:
http://www.microsoft.com/downloads/d...displaylang=en
Keep in mind you're still going to have to install any patches or hotfixes from Windows Update if you use that downloadable package.
However this is a very rare occurance (If it's true for you, then you're the second person I've encountered with that problem since I've been here) But at this point it sounds like that's the culprit. (If you've already installed and updated the .Net Framework from Windows Update that is)