solusi kalau tidak bisa nginstal program

"The Windows Installer Service Could Not Be Accessed" error message when you install a program in Windows XP

1. Log on to your computer as an administrator.
2. Click Start, and then click Run.
3. In the Open box, type cmd, and then click OK.
4. At the command prompt, typemsiexec.exe /unregister, and then press ENTER.
5. Type msiexec /regserver, and then press ENTER.
6. type exit, and then press enter.

sumber: http://support.microsoft.com/kb/315353