I wanted to add more to the above post, but it got too long. Here is more info.
Instead of dragging a PVM to the Mac, as I described, here are some details of other ways to get data from PC to VM.
You would first do a "programs only" migration via the network or external storage. Then from inside the new VM you can copy your files from the old PC - either via a network connection, or from a CD. If via network, make sure all necessary areas of your PC are set up to be shared; open a network connection to the PC via its IP address, for instance by typing \\192.168.1.x in a folder address bar, or in the "Run..." option on the Start menu.
I have found that this works whether the VM is isolated or is sharing with the Mac, and even if you are using a shared profile as long as you do it carefully.
On my system, when there is a shared profile, Parallels sets up a Windows Library structure along the lines of:
-Libraries
- Documents
- Documents (which points to \\Mac\Home\Documents)
- Public Documents (which points to C:\Users\Public\Documents)
- Local Documents (C) (which points to C:\Users\<you>\AppData\Roaming\Local Libraries\Documents
This same scheme is repeated for Music, Pictures and Videos.
The folders in those "Local Libraries" are links to your actual user folders, wherever they actually may be.
Sometimes some of the libraries may have duplicate names; for instance, Public Documents may also be named just "Documents." You can rename these.
Your user folders will still be in the same place as ever, but will no longer be marked with special icons. AppData\Roaming\Local Libraries will seem to contain all your local data, but these are just links to your real user folders.
If you isolate the VM, the Library structure is changed.
-Libraries
- Documents
- Documents (now points to your actual user documents folder)
- Public Documents (which still points to C:\Users\Public\Documents)
There is no longer a separate library member called Local Documents. The Documents entry is itself the local documents. This is similar to the normal Windows 7 library, except that Documents is usually called My Documents.
Your actual user folders will also be similarly named (Documents, Music, etc. rather than My Documents...), but they will regain their special icons.
AppData\Roaming\Local Libraries will still exist, but will be empty. Parallels removes those junction points.
If you are using a shared profile, be sure you copy files to Local Documents or to the real location of your documents on your original hard drive, not to Documents, which is mapped to the Mac; similarly, with shared profile enabled, the VM's Desktop is actually showing the Mac desktop, and files dropped there will actually be stored on the Mac.
Sorry this is so long!