Without being able to run a scan, we're rather limited in the amount we can do, since we don't have the necessary information to work from.
The infection we've removed so far does not usually exhibit the type of symptoms that you're suffering from.
My gut feeling is that your problems are not being caused by Malware, although it's impossible for me to confirm that because of our inability to run a wide ranging AV scan.
There's something I'd like you to do for me, that may have some effect on your ability to run a scan, but it may equally be ineffective.
First ...- Click Start, and in the Search programs and files field, type cmd.
- A list of search finds will open.
- At the top will be cmd.exe
- Right click on it and select Run as administrator
- A command window will open.
- Type chkdsk c: (note the gap between chkdsk and c:)
- Hit Enter.
- Maximise the command window and wait for the scan to finish. This usually takes quite a while.
- Read the results to see if it says that it found problems with your file system.
- IF it has found problems with your file system.
- Click Start, and in the Search programs and files field, type cmd.
- A list of search finds will open.
- At the top will be cmd.exe
- Right click on it and select Run as administrator
- A command window will open.
- Type chkdsk c: /F (note the space between chkdsk and c: and between c: and /F)
- Hit Enter.
- You will get a message that the volume is locked, and a request to do the repair on Reboot, answer Y
- Type exit to close the Command window.
- Go to Start > Turn off Computer and choose Restart
- On restart, Windows will attempt to fix any problems that it found. This usually takes quite a while.
Tell me what it found originally, and if there were any damaged files, whether Windows was able to fix them.
Next ...If there was damage to your file system, and Windows was able to fix them, then try running one of the AV scans again and see if you can get a log. No need to try them all, if one fails it seems likely that the others will as well.