Invalid drive u: and wrong document ownership

Hi

I am installing some software on a laptop (Toshiba L300, Win XP pro, Dual core 2.0GHz, 2GB Ram)

I get an error message Invalid drive u: and the installation fails.

I followed an article in microsoft knowledge base to edit registry.

In shell folders there is an entry for personal which had u: in the data field.

The documents folder should be a network drive y: so I changed it to that.

The program installed but now when I try to open a document from the network documents folder it says I don't have permission.

How can I fix this?

I have been thinking about this problem.

I cloned the drive from an identical computer registered to jbloggs, then copied this clone to this laptop changed the computer name, user name and network documents folder to asmith.

Some of the registry settings and document ownership is still jbloggs.

Is there something else I should have changed somewhere?

Any help appreciated

Regards Melissa