KenA,
Sounds like you could have a rootkit let's check that first.
Download tdsskiller from here
http://www.bleepingcomputer.com/download/tdsskiller/And run it, if it fails to start rename TDSSKiller.exe to iexplore.exe
When the program opens, click the Change parameters.
Check the boxes beside Verify Driver Digital Signature and Detect TDLFS file system, then click OK.
Click on the Start scan button to begin the scan and wait for it to finish.
If any infection or suspected items are found that are files that are shown to fail signature check do not take any action on these. Make sure you select Skip.
If 'Suspicious objects' are detected, the default action will be Skip. Leave the default set to Skip and click on Continue.
If Malicious objects are detected, they will show in the Scan results. TDSSKiller automatically selects an action (Cure or Delete) for malicious objects
Make sure that Cure is selected. Important! -> If Cure is not available, please choose Skip instead. Do not choose Delete unless instructed to do so.
Whether an infection is found or not, a log file should already be created on your C: drive ( or whatever drive you boot from) in the root folder named something like TDSSKiller.2.1.1_27.12.2009_14.17.04_log.txt which is based on the program version # and date and time run.
Post the contents of the log file into your reply