The Windows Installer Service could not be accessed.

วิธีแก้ปัญหา
The Windows Installer Service could not be accessed. This can occur if you are running Windows in a safe mode, or if the Windows Installer is not correctly installed. Contact your support personnel for assistance.”

ทำตามขั้นตอนดังนี้

Click Start
click Run
พิมพ์ MSIEXEC /UNREGISTER
click OK

Click Start
click Run
พิมพ์ MSIEXEC /REGSERVER
click OK
รอสักครู่

หลังจากนั้นลองทดสอบลงโปรแกรมดูอีกครั้งครับ

when The ARP entry addition failed: Access is denied.

delete : netsh interface ip delete neighbors "Network card name here" "Gateway.IP.goes.here"

Add : netsh interface ip add neighbors "Network card name here" "Gateway.IP.goes.here" "MAC-address-of-gateway-with-dash-here"

Windows 7 – Enable Telnet

It’s very rare that I use Telnet these days, so it took a long time for me to notice that by default it was not packaged with Windows 7. I did some research and found out that this was also true for Windows Vista. More than likely this was an attempt to make Windows more secure by default, as Telnet is very insecure and whenever you have the choice you should always use SSH. However, with that being said, you can quickly re-enable Telnet by following these steps:

1. Start
2. Control Panel
3. Programs And Features
4. Turn Windows features on or off
5. Check Telnet Client
6. Hit OK

After that you can start Telnet via Command Prompt.

copy ทั้งดุ้นมาจาก http://www.fettesps.com/windows-7-enable-telnet/