getting rid of install folder with guid/has name such as '730c1fa0656fdc17095acd72'

I have a problem with my new XP installation. This is what I have done, all
partitions NTFS unless otherwise noted:

PC has two physical hard disks:
* Disk #1A (external eSATA)
Partition 1A: OS (already too small)
Partition 1B: OS overflow (more program installations, some data)
Partition 1C: Data
* Disk #2A (internal)
Partition 2A: Extra data and transfers
Partition 2B: Linux

This installation is several years old and running very slow and
applications on the notification area crash down like domino if I close one
or the other. So I decided to buy another external hard disk (eSATA) to give
the installation a new life. The idea is to reinstall everything on the new
one but better organized (less and larger partitions, etc.).

* Disk #1B (external eSATA)
Partition 1: OS (XP)
Parition 2: DATA
* Disk #2A (internal, the same shared disk as old/original installation
above)

So, On the new installation I use the same internal drive (2A) to move
things between the 1st installation (bootable) and the 2nd (bootable), in
other words Disk 1A and 1B.

The problem is this.... On my shared disk (2A) that is common to both
bootable systems about four (4) weird directories have started to pop up,
their names resemble a GUID or hash value:

- 730c1fa0656fdc17095acd72
- 8903ac6c1bca810cb792
- d25a64e48f52bc4ba1a47b
- 996e364293f54aa266a4

I want them away! I have tried disk cleanup (remove all options), removing
restore points and they don't go away. I log in as administrator and when I
try to delete them I get "Access Denied!" or sometimes I can browse the
directory but not delete it.

Any other way to get rid of this space-wasting directories?

Emil