an instance of setup is already running . only one instance of setup can run at

[Anonymous]

I can't install Autodesk software 

[Anonymous]

Hi, First of all you have posted in the wrong forum - your problem has nothing to do with Modeling. There is a forum specifically for:
INSTALLATION - HARDWARE - OS
another tip - give as much info as you can - ie; version, installing on-line or from a standalone? ECT....