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System spec's are always a help first: O/S, memory, graphics card & driver version...
You followed all the requirements for installation>
1.) Logged in with Administrative privileges
2.) UAC turned off
3.) Anti-Virus disabled
Inventor 2020, In-Cad, Simulation Mechanical
Just insert the picture rather than attaching it as a file
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Delta Tau Chi ΔΤΧ
System spec?
Have you tried loading different parts, or creating new parts, as well as the loading of drawing and assemblies?
Have any directories been moved around on the system or deleted.
Try using a different log-in, you might have a problem with your log-in profile.
Inventor 2020, In-Cad, Simulation Mechanical
Just insert the picture rather than attaching it as a file
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Delta Tau Chi ΔΤΧ
There should be a utility on the Autodesk-Inventor website for doing a clean un-install. Handy to clean the Windows Registry of any old entries.
Inventor 2020, In-Cad, Simulation Mechanical
Just insert the picture rather than attaching it as a file
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Delta Tau Chi ΔΤΧ
Run a utility such as "ccleaner.com" to purge all temp files/folders first.
Inventor 2020, In-Cad, Simulation Mechanical
Just insert the picture rather than attaching it as a file
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Delta Tau Chi ΔΤΧ
Solved - not ideal solution:
After spending many hours installing, uninstalling, reinstalling, cleaning, deleting files, redownloading, etc I decided to reinstall Windows 7. It was not the ideal option but after realizing that inventor 2012 was also displaying the same error (Am.dll could not be loaded) during its install it dawned on me that it was a systemic problem instead of specific problem with inventor 2013. I still have no idea what the importance of Am.dll in the grand scheme of things in the program. I do know that it is important for the appropriate ribbon to disply, ensuring the appropriate datum planes show up and the "FeatureCatalog" is loaded.
For those who run into a similar problem I would recommend that you start backing up your files and start looking for the reinstall discs. It will, in the long run, save you an enormous amount of time, unless you get lucky and figure it out. Then please post here. 
Also, thanks to blair for helping me troubleshoot the problem.
Good to here that it sounds like you have tracked/narrowed the problem down.
About 10 years ago, we added an automatic defrag software to our servers and desk-tops PC's. This reduced the number of (odd) errors throughout the network.
Proper house-keeping on a system helps in the long run. Purging of Temp files and Caches along with regular Defragmentation of the discs keeps the machines running at a optimum level. This is one of the first things I do, if I get called to help out a friend with PC problems.
All desk-top PC's and servers on our network get full back-ups each night and our critical as well as get Defrag software installed before they are placed in service.
Inventor 2020, In-Cad, Simulation Mechanical
Just insert the picture rather than attaching it as a file
Did you find this reply helpful ? If so please use the Accept as Solution or Kudos button below.
Delta Tau Chi ΔΤΧ
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