If you are unable to install certain application due to continuous occurrence of Psapi.dll error then don't do any delay and try immidiate steps to fix psapi.dll error. It is serious error that can casue destructive damages to your system if remain unfixed. It can give rise to series of error messages like Blue Screen Error of Death, registry error, memory error, exe and dll errors. This type of error appears due to missing or incorrect versions of psapi.dll error. Most of the time incomatible drivers and damaged registry also gives rise to psapi.dll error. so, you should replace your old drivers and repair damged registry in order to fix psapi.dll error. You can repair your corrupt registry using effective Registry Repair Software. For more information visit:http://www.psapidllerrorfix.com/