I've encountered the error on my Dell Inspiron 1545 since yesterday. Here is what happened so far: - I burned a copy of Windows Defender Offline to a bootable DVD using another laptop. - I scanned my laptop using Windows Defender Offline. The results mentioned that I have "Win32/sirefef.R" and "Win32/sirefef.AH". Windows Defender Offline failed to disinfect it. - I scanned it again just to be sure, and got the same result. - I burned a copy of Kaspersky Rescue Disk 10 to a bootable DVD using the other laptop. - I scanned my laptop using Kaspersky Rescue Disk 10. It said that "services.exe" is affected, and let Kaspersky disinfect it. - I scanned it again just to be sure. It said that no threats found. - I restarted my laptop to see if my laptop is fixed. I still got that error. Your help would be greatly appreciated. Thanks.