I've been trying out a load of different freeware programs on my recently-built Vista 64 system. Some worked and some didn't. Anyway, here is a list of the things that are running well and are completely free for personal use:
1. Antivirus: AVG Free Edition (latest version: 7.5)
2. Disk cleanup: Piriform CCleaner (latest version: 2.03.532). Bonus: also cleans up your Vista 64 Registry!
3. Graphics viewer (useful for slide shows): IrfanView (latest version: 4.10)
4. Graphics Editor (for manipulating images): GIMP (latest version: 2.4.2)
5. Download manager: Free Download Manager (latest version: 2.5 build 728)
6. ADSL modem tweaker: DMT tool (version, availability depends on your ADSL modem)
7. Benchmark software: Sandra Lite XIIc
8. Internet Browser: Firefox (latest version: 2.0.0.11)
9. ZIP/archive manager: UltimateZip2007 (latest version: 3.2)
10. PDF file reader: Adobe Reader 8 (latest version: 8.1.1)
11. Media Player codecs (allows Media Player to play DivX/Xvid, etc): VistaCodecs (aka Vista Codec Package, latest version: 4.5.3)
You can Google for the downloads of these programs. Feel free to add to this list or offer altenative suggestions that are tested and working on Vista 64. I'm after a free disk defragmenter for Vista 64 that's better than the built-on one at the moment.