The Windows 7 installer will fail on US15W based netbooks like the Dell Mini 10 if attempted installed on a trim-enabled SSD like the Intel x25-m with the newest firmware.
The US15W chipset internally uses a PATA controller. To connect to SATA drives, a bridge chip is used. The drive annouces trim capability when queried by the Windows installer, but the bridge chip does not support passing trim commands to the SATA SSD drive, causing data transfers to the drive to fail.
Install a previous version of Windows, then install Windows 7 from that installation and finally disable trim support in the registry from a Bart PE boot CD/key twice during installation reboots.
I can't install Windows7 on my EEE 1201ha with US15W chipset. I installed Windows XP as you say, but I don't understand how I need configure Bart PE...can you explain me please?