For dll see
http://foldoc.doc.ic.ac.uk/foldoc/foldoc.cgi?Dynamically+Linked+Library

For Wtools.dll
http://www.winpatrol.com/db/freesample/wtoolsa.html

To remove restore point you can try safe mode first.
If that does not work you will have to use DOS.
See: http://www.computerhope.com/msdos.htm

Your questions are complex that is why I provided the web sites and not answers. WinTools is a tough spy-ware application to remove. You may also want to see,
http://reviews.cnet.com/5208-6122-0.html?forumID=44&threadID=33713&messageID=389709
Also
http://reviews.cnet.com/5208-6132-0.html?forumID=32&threadID=39769&messageID=467105
My efforts to remove the Bagle worm.

So don't get to frustrated....

Bill
.