atmclk.exe is definitely adware and it is related to spyware falcon and that family of browser hijacks. Here is link to information about that proces amtclk.exe info
It appears you do indeed have a spyware quake hijack, among other things, based upon your symptoms. I suggest posting a HJT log in the "HJT logs and analysis' forum here at BC.
Please read Prep Guide for Posting HJT LogsPlease follow these preparation directions exactly.
Then run HJT and post the log it creates in the HijackThis Logs and Analysis Forum
, which is found at this link: HJT ForumDO NOT FIX ANYTHING YET.
An expert HJT helper will promptly respond to your post within a few days with instructions on how to fix your computer. NOTE
Once you have made your post, please do not add any replies to your post (don't bump it). HJT helpers look for posts with 0 replies to determine the proper order to help users.
If you are interested in trying the self-help guide for removing spyware quake, that tutorial can be found at this link: How to Remove Spyware Quake
You also said you are having a problem with Limewire. Just a tip: It's generally a good idea to make sure p2p programs are not running on startup if that is the case. It appears you may have more than one malware infection and there isn't much help we can provide through this forum. Please post a log in the HJT forum and we'll get your computer cleaned up