Just to prove that it can be done, Ive installed a copy of Windows Vista Home Premium on the little Asus EEE PC 900. The specs are as follows:
900Mhz Celeron Mobile
1GB Ram
20GB Flash Hard drive
The HDD is made up of a 4GB + 16GB module. The OS is installed on the 16GB module.
Its a little slow as expected but for music, DVDs, photos, MS Office and the Internet its fine.
It wont do high end PC tasks but that is to be expected.
The machine will run TV tuners, synchronise with devices with Windows drive