[gripe]
A few months ago various people tried to help me solve a problem on my laptop:
XP problems
I didn't get anywhere at the time and have lived with the issue since.
Finally a couple of days ago I decided enough was enough and tried a variety of free things like Spybot, Ad-Aware, Malwarebytes, etc. None of these found anything wrong. Norton hadn't found anything but was giving lots of warnings.
So I decided to give Norton's Power Eraser a second chance. I ran it and it found just one suspicious file - "wmiacpi.sys". (I suspect I must have clicked the wrong option when I tried it before.) It asked whether I wanted to create a restore point before taking action. I said yes and the system was cleaned. The problem now seems to have been solved. Except for two small things.
When I closed down the laptop it took ages because of 57 Windows updates (I'd noticed there hadn't been any updates recently but hadn't associated it with the virus issue).
Then when I booted up this morning, Norton helpfully informed me that the restore point files were infected (presumably because the infection was removed
after the restore point was created). If it can do that why can't it detect the file in the first place??? The next step was to remove all the restore points. Now that's been done everything does seem OK.
Final question: if Norton's Power Eraser (a free download extra once you have the basic service) can find the file why not include that functionality in the main software?

[/gripe]
My laptop does seem clean though.