Do you mean that Shredder is not deleting all files in your temp folder(s) ?
If that's what this is about then that behaviour is normal. Not all temporary files can be deleted anyway.
It's because of the way Windows works.
Those two files are part of Conduit Search which is generally considered to be a PUP - an undesirable program.
"... a browser hijacker that is bundled with other free software".
Was it McAfee that detected this or some other program?
Have the files been quarantined, and if so by which program?
If not quarantined, can you see where the files are located?