Is Sophos really scanning?

I just ran a scan before going to bed, and it was done when I woke. I checked the log file and it was full of

2013-03-19 01:05:11    Could not open C:\pagefile.sys
2013-03-19 01:18:39    Could not open C:\System Volume Information\{3808876b-c176-4e48-b7ae-04046e6cc752}
2013-03-19 01:18:39    Could not open C:\System Volume Information\{4af6fdb1-8c35-11e2-98cb-00e0611000bf}{3808876b-c176-4e48-b7ae-04046e6cc752}
2013-03-19 01:18:39    Could not open C:\System Volume Information\{bd212c77-8d72-11e2-a428-00e0611000bf}{3808876b-c176-4e48-b7ae-04046e6cc752}
2013-03-19 01:18:39    Could not open C:\System Volume Information\{bd212c98-8d72-11e2-a428-00e0611000bf}{3808876b-c176-4e48-b7ae-04046e6cc752}
2013-03-19 01:18:39    Could not open C:\System Volume Information\{bd212ca5-8d72-11e2-a428-00e0611000bf}{3808876b-c176-4e48-b7ae-04046e6cc752}
2013-03-19 01:18:39    Could not open C:\System Volume Information\{e0896410-6ab1-11e2-8932-00e0611000bf}{3808876b-c176-4e48-b7ae-04046e6cc752}
2013-03-19 01:18:39    Could not open C:\System Volume Information\{e0896415-6ab1-11e2-8932-00e0611000bf}{3808876b-c176-4e48-b7ae-04046e6cc752}

There is a fair amount of that in the log. So is Sophos not working?

Dave