Windows Installer is one of the windows services. In my opinion, u can't install any soft because RPC service don't running (require for Windows Installer service).
1.
Open services list:
Start->Run, write "services.msc", press Enter
2. Find "bla-bla-bla (RPC)" service (don't know name on english WinXP, russian name is "Удаленный вызов процедур (RPC)")
Set to Auto and start service.
Try install now.
If step 2. don't solve problem, find "Windows Installer" service and start this service manually before you click on setup.exe.
I hope, this info'll helps you, good luck.
