Barusan install firewall di Windows XP. Tau tau ada process alg.exe nyoba konek masuk ke kompie, kirain worm/spyware nyaris di-block. Setelah googling, ndak taunya itu emang process di Windows XP, walaupun menurut beberapa website sering dihinggapin trojan/spyware. :)

alg.exe (Application Layer Gateway)

The alg.exe process is part of the internet connection sharing and internet firewall components in Windows XP. If you use a non microsoft firewall and don’t share printers or files it is safe to stop this process.

alg.exe is flagged as a system process and does not appear to be a security risk. However, removing Application Layer Gateway may adversly impact your system. (http://www.auditmypc.com/process/alg.asp)

Process name: Application Layer Gateway Service
Product: Windows
Company: Microsoft
File: alg.exe

Security Rating:
Application Layer Gateway service is a component of of Windows OS. It is required if you use a 3rd party firewall or Internet Connection Sharing (ICS) to connect to the internet. Do not end this program in task manager – you will lose all internet connectivity until next restart or login. (http://www.neuber.com/taskmanager/process/alg.exe.html)