Hello DavidR,

Thanks for your reply. It was educational for me. Seems that some things be left alone.
However I got another notice and clicked on “Block” then another popup showed up to wit:-

Avast File System Shield has blocked a threat.
No further action is required.
Object: Infection Win32Injected-BA [PUP]
Action:
Process C:\Program Files\Seagate.…\MaxBackServiceInt.exe

The threat was detected and blocked when the file qwas created or modified.

Add file to the Scan Exclusion List.

I complied and added the file to the list.

Further I did some checking via Administration Tools, Computer Management. I checked in Applications and found that since 17/11/2011 when I deleted the files mentioned in my initial post, (which I should not have done) I have seen no Winlogon entries. I started my computer system a few times thereafter and noted that there are no Winlogon entries.

Could this be because of the deletion of those files from the location System Volume Information.…\A52078.exe? and I know that I asked this question already but I need a second opinion as to whether I should do a clean instal of my OS?

I am at sea here and would appreciate some advice.

Thanking you.

standeb.