You can try using this tool to remove all traces of previous version(s) of Reader:
Then, you may download the offline Reader installer from
After downloading, restart your computer and run the installer before doing anything else.
Error 1500 means that Adobe Reader installation finds that Windows Installer Service is busy.
You have 3 option:
1. Wait while Windows Installer Service is not busy - most likely Windows Update is in progress
2. Cancel Windows Update temporarily
3. Restart your computer and try again - sometimes Windows Installer Service does not release special Mutex