If you wish to find new files created, use File Explorer's Search feature on the top right of the window. You can specify dates.
Done that already. Nothing found.
However it looks like I may have sorted the problem out, anyway, by downloading and running, in order, SUPERAntiSpyware and Ad-Aware Antivirus.
Ad-Aware Antivirus didn't seem to come up with anything but SUPERAntiSpyware found several items which were removed. One item looked like an old registry entry and the others were all tracking cookies. After these were removed a reboot was required (which was delayed) and I discovered I now had 28.6GB on the disk.
Accounting for the space taken by AdAware Antivirus itself, 736MB and SUPERAntiSpyware, 10.3MB, this would leave 29.3GB available on the disk which is very close to what it was before.
Seems strange Norton 360 missed these items, however I have noticed Norton 360 doesn't seem to be performing that well with Vista these days. When you load it up to perform manual tasks it is very slow indeed to load indeed.
For your reference here are the text reports from SUPERAntiSpyware:
Database Version : 15164
Scan type : Critical Point Scan
Total Scan Time : 00:06:01
Operating System Information
Windows Vista Home Premium 32-bit, Service Pack 2 (Build 6.00.6002)
UAC On - Limited User (Administrator User)
Memory items scanned : 716
Memory items detected : 0
Registry items scanned : 28817
Registry items detected : 1
File items scanned : 4191
File items detected : 0
Adware.PTech
HKU\S-1-5-21-4238356135-1069967474-2706294926-1000\Software\PTech
============================
Unwanted Programs Detected
============================
MoboGenie
============
End of Log
============
SUPERAntiSpyware Scan Log
http://www.superantispyware.com
Generated 11/25/2018 at 02:52 PM
Application Version : 8.0.1024
Database Version : 15164
Scan type : Quick Scan
Total Scan Time : 00:04:02
Operating System Information
Windows Vista Home Premium 32-bit, Service Pack 2 (Build 6.00.6002)
UAC On - Limited User (Administrator User)
Memory items scanned : 714
Memory items detected : 0
Registry items scanned : 28817
Registry items detected : 0
File items scanned : 4594
File items detected : 8
Adware.Tracking Cookie
C:\USERS\G ALEXANDER\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][2].txtC:\USERS\G ALEXANDER\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][2].txt [ Cookie:g
[email protected]/ ]
C:\USERS\G ALEXANDER\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][1].txtC:\USERS\G ALEXANDER\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][1].txt [ Cookie:g
[email protected]/ ]
C:\USERS\G ALEXANDER\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][2].txtC:\USERS\G ALEXANDER\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][2].txt [ Cookie:g
[email protected]/ ]
C:\USERS\G ALEXANDER\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][1].txtC:\USERS\G ALEXANDER\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][1].txt [ Cookie:g
[email protected]/ ]
C:\USERS\G ALEXANDER\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][1].txtC:\USERS\G ALEXANDER\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][1].txt [ Cookie:g
[email protected]/ ]
C:\Users\G Alexander\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][1].txtC:\Users\G Alexander\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][1].txt [ /ml314.com ]
C:\Users\G Alexander\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][1].txtC:\Users\G Alexander\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][1].txt [ /amazon-adsystem.com ]
C:\Users\G Alexander\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][1].txtC:\Users\G Alexander\AppData\Roaming\Microsoft\Windows\Cookies\Low\
[email protected][1].txt [ /openx.net ]
============
End of Log
============