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That's a bummer. I'll have to try the Steam version whenever I get a system running Vista.

Clamwin + Clam Sentinel gets you real time scanning, and its still lightweight.

http://blog.livedoor.jp/blackwingcat/archives/1313117.html

The good old modification way Download the 64bit ESR Version and Extract It,Now look inside the Extracted Folder There Will Be A Folder Called Core,Open It And You Will Notice the Firefox Application In There, Now This Executable Files SubSystem Version And OS Version Needs To Be Changed From 6.1 To 6.0 To Run It, Otherwise You Get A Win32 Application Error. Once you Change Those Values It Should Work Like the 32Bit ESR Version Which is Forcibly Given By Default. ( I Use PEMaker)

Really weird how Firefox ESR 64-bit requires Windows 7 or above. There is nothing extended about it's support since it's just like the normal releases.

Avast supports XP and is probably the most complete antivirus with streaming updates (definitions are updated in real time), a firewall, a custom browser based on chromium that allows you to do internet banking and others "risky" things safely on XP thanks to the extra security layer, SecureLine (which allows you to use a VPN service - not in the free version, though -), a ransomware shield that protects all your file system resources from being accessed by untrusted third part applications, Secure DNS which allows you to use other DNS and access websites that are blocked in your country, a SandBox which allows you to load risky executables in a virtual environment, without the risk of infecting your real system, a Wifi inspector which tells you whether the wifi you are connected to is secure or not, a software updater which tells you which software needs to be updated and can, eventually, update it for you in background, a rescue disk which allows you to create a Disk or a USB with Avast Antivirus in it to clean up other computers (or your own computer) if it doesn't boot, a boot-time scan that allows you to scan for viruses before Windows starts in order to remove even the nastier threats, a mode to save all your password into a master password that encrypts them all and handle them for you (still in beta in XP, though), an email antivirus and antispam, a data shredder that allows you to permanently destroy files by writing random data in the cells of the files you want to permanently delete and finally a sensitive data shield which enables you to protect and encrypt your personal documents and prevent third part applications from accessing them. In other word, Avast is my way to go. I have Avast Premier in my pc and I'm a beta tester.

Photoshop :-)