If you ever get a Windows Installer Error Code 3728, I found a really easy fix that might work for you. ( I say might because I’ve had many problems with MSI installers over the years and it has normally been a lot of trial-and-error to fix them.) As with any fix I post, follow these steps at your own risk. There’s no way I can know every single configuration out there and your mileage may vary.

1. Click Start, type regedit.exe, and press enter (Give the ok for Administrator privileges if you have UAC enabled).
2. Right-click on the HKEY_CURRENT_USER hive and choose Find…
3. Type (or copy and paste) this key into the find box: {B54F3741-5B07-11cf-A4B0-00AA004A55E8}
4. If this key is found anywhere in the HKEY_CURRENT_USER hive, right-click and Delete it. Very, very important: Do not delete this key from any hive other than HKEY_CURRENT_USER. Doing so may seriously mess up your system.
5. Re-run whatever you were trying to install that was failing. If the install goes through, you’re good to go. If not, keep Googling because that’s all the medicine I’ve got for Error Code 3728 :)

As far as why this error occurs, it has something to do with the TrustedInstaller account permissions. The various sources I read to help me fix this issue had a lot of conflicting information and I managed to piece this fix together from bits and pieces of a few of them. I hope this helps!