I did MBAM log, but as the symptoms were back I restarted in Safe mode and did the scan with the MBAN there. Nothing found.
Malwarebytes' Anti-Malware 1.51.2.1300
www.malwarebytes.org
Database version: 8005
Windows 5.1.2600 Service Pack 3
Internet Explorer 8.0.6001.18702
23.10.2011 16:17:39
mbam-log-2011-10-23 (16-17-39).txt
Scan type: Quick scan
Objects scanned: 164890
Time elapsed: 4 minute(s), 54 second(s)
Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 0
Memory Processes Infected:
(No malicious items detected)
Memory Modules Infected:
(No malicious items detected)
Registry Keys Infected:
(No malicious items detected)
Registry Values Infected:
(No malicious items detected)
Registry Data Items Infected:
(No malicious items detected)
Folders Infected:
(No malicious items detected)
Files Infected:
(No malicious items detected)