I know the feeling that is why I just got rid of my 5 year old PC and bought a new one. I just finished loading some software and the tethered shooting works fine.
However, the Vista must be 32-bit because the Canon driver will not work with 64-bit.

Fortunately I got the 32-bit Vista Premium. My computer is just a basic HP Slimline 3710t (it is physically 1/3 the size of a regular PC)with 7200 rpm harddrive, 3 GB memory
HP Pavilion Slimline s3710t PC, etc here is a list.
- Genuine Windows Vista Home Premium with Service Pack 1 (32-bit)
- Intel(R) Core(TM) 2 Duo processor E7400 [2.8GHz]
- 3GB DDR2-800MHz SDRAM [1x2048,1x1024]
- 320GB 7200 rpm SATA 3Gb/s hard drive
- Integrated Graphics (NVIDIA GeForce 7100) [VGA]
- LightScribe 16X max. DVD+/-R/RW SuperMulti drive
- Integrated 10/100 Ethernet, No wireless LAN
- 15-in-1 memory card reader, 2 USB, headphone port
- No TV Tuner w/remote control
- Integrated 5.1 channel sound with front audio ports
- No speakers
- HP keyboard and HP optical mouse
- Microsoft(R) Works 9.0
- No additional security software
- HP Home & Home Office Store in-box envelope
Cost delivered $500.
Photography is just a hobby so I don't need the big stuff.
Happy shopping
