Uninstall ALM-Client

1. Delete all files under following locations:
    %ALLUSERSPROFILE%\HP\ALM-Client
    %UserProfile%\AppData\Local\HP\ALM-Client
    %LocalAppData%\HP\ALM-Client
    %ALLUSERSPROFILE%\Application Data\HP\ALM-Client
    %UserProfile%\Local Settings\Application Data\HP\ALM-Client
    %temp%/td_80

2. Reopen ALM.

Source:
http://h30499.www3.hp.com/t5/Quality-Center-Support-and-News/How-do-I-uninstall-the-ALM-QC-v11-client/td-p/5616791#.UzAebvmSxlT