C:\WINDOWS\System32\wuauclt.exe
On Win ME wuauclt.exe is a valid system file related to Windows updates; on all other versions of Windows, it indicates a trojan. The description is here:
http://securityresponse.symantec.com/avcenter/venc/data/backdoor.clt.html
I would seriously suggest the following if you haven't done this already:
- Get the most current virus definitions for your anti-virus program and do a full system scan.
- Get the latest versions and/or definitions for Ad Aware, SpyBot Search & Destroy, CWShredder, and SpywareBlaster. Set the scanning/protection level options for these programs as high/thorough as possible, run/install the programs (rebooting after executing each one), let them fix whatever they find, and then post a fresh HJT log after that.