DottieR, that detection could well be a false positivehttp://forums.superantispyware.com/index.p...en-cryptoregun/
If you would, please look at the SAS log and tell me what file is being detected and what folder it's in. I would strongly suggest that you run an ESET online scan--there is a link below.
Following is what I have been writing out before the last two posts were posted, so apologies that it's a little dated now, but most of it is still relevant.
I wouldn't worry about running CWShredder--it's an obsolete tool designed to fix obsolete malware so is really a waste of time. It essentially was obsolete shortly after Trend Micro bought it in 2005. CWS had gone to its About: blank family of malware at that time, which the Shredder really couldn't fix, and then About: blank was abandoned a year or two later. So it hasn't been a useful tool for four or five years now.
Similarly, I haven't seen Stinger be very effective either. We used to have people run it here at BC before they posted logs in the malware removal forums but removed it since it didn't seem to help with anything.
I agree tho that if your anitvirus, along with MBAM and SuperAntiSpyware don't find anything serious then you probably are OK. Altho this doesn't really take into account the possible presence of a rootkit, which is what you have to worry more about in today's internet world. In general, tho rootkits give themselves away by the behavior of the malware they hide, so if you have any other odd behavior happening, please let us know. Currently its common that Google gets redirected to a fake or rogue search site.
What I would suggest as a supplementary scan is an online virus scan, in case Avast has been compromised and as a second opinion. A good one is ESET: http://www.eset.com/online-scanner
I suspect the problem with the Winlogon key may be the result of Avast getting corrupted on its own. You might look around the Avast forums to see if anyone has reported such a thing. We can look into this further when you have posted back you scan results.