多谢您。我今天打开机器看了，make sure 唯一的硬盘设为master.

可它在"my computer" 显示为 E 盘。I tried to change the name of the hard drive, but failed because of the displayed warning "Windows cannot modify the drive letter of your system or boot volume."

我现在install有些software时，必须先在dos中run:
subst c: e:/
to assign drive E to a virtual drive C.

我会去买个大的（500GB or 750GB?, and then partition) HD． Then I'll set the 2 disks as master and slave disks respectively. 会考虑用您建议的imaging 方法。不过会很小心，从来没做过, and I have a lot of programs in my current hard disk in drive E.

非常感谢。