Thank you very much for your help. One object was found and removed (see below), however, I have just visited my MySpace profile again and Avast alerted me with a different URL Mal:
Infection Details
URL:
http://www1.strongpqcleaner.dnset.com/O....
Process: C:\Program Files\Mozilla Firefox\firefox...
Infection: URL:Mal
!!
Shall I run Malwarebytes again?
Malwarebytes Anti-Malware 1.61.0.1400
www.malwarebytes.orgDatabase version: v2012.05.27.02
Windows XP Service Pack 3 x86 NTFS
Internet Explorer 8.0.6001.18702
dell owner :: OWNER-25721C41B [administrator]
27/05/2012 11:45:51
mbam-log-2012-05-27 (11-45-51).txt
Scan type: Quick scan
Scan options enabled: Memory | Startup | Registry | File System | Heuristics/Extra | Heuristics/Shuriken | PUP | PUM
Scan options disabled: P2P
Objects scanned: 179764
Time elapsed: 40 minute(s), 24 second(s)
Memory Processes Detected: 0
(No malicious items detected)
Memory Modules Detected: 0
(No malicious items detected)
Registry Keys Detected: 0
(No malicious items detected)
Registry Values Detected: 0
(No malicious items detected)
Registry Data Items Detected: 1
HKLM\SOFTWARE\Microsoft\Security Center|UpdatesDisableNotify (PUM.Disabled.SecurityCenter) -> Bad: (1) Good: (0) -> Quarantined and repaired successfully.
Folders Detected: 0
(No malicious items detected)
Files Detected: 0
(No malicious items detected)
(end)