SDFix didn't find anything, didn't delete anything. You didn't have to disable any security for the programs you've run so far.
You can remove SDFix like this, if there are still any files from it:
Boot into Safe Mode
- Restart your computer and start pressing the F8 key on your keyboard.
- Select the Safe Mode option when the Windows Advanced Options menu appears, and then press ENTER.
Delete the files saved under the SDFIX folders. Then delete the folders.
You would do this in Windows Explorer.
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Original Problems
1. Google search redirects to a different site
sometimes when I click a search result.
2.
Sometimes I get a
new Firefox browser window with 3 tabs to varying websites.
New Problems
1. Laptop lost the ability to connect to the internet.
2. Can't read or write a CD-RW disk.
3. System display appeared to be in Safe Mode when in Normal Mode
4. Avira was disabled (didn't you disable it?)
System Restore resolves all new problems, but original problem remain.
Assessing problems:
1. If you had malware causing a redirect from a Google search, it should redirect on ALL of the searches.
2. Malware
can cause Firefox to start together with Windows and probably display malicious sites. But this is on boot
3. What are the URLs for the 3 tabs when Firefox comes up on a search? Are they the same sites every time?
Checking the validity of Firefox:
1. Did you install Firefox from anywhere other than the Mozilla website?
There are some websites that legitimately offer Firefox; but many are not trustworthy
2. Did Firefox come bundled with other software?
Firefox does not come bundled with other software.
3. Do you get an error message when you start Firefox, telling you to use Internet Explorer?
A virus is known to cause this message.
4. Did you have to pay to download and install Firefox?
Mozilla Firefox is free.
Are you sure it is the
real Firefox coming up with the 3 tabs?
Misleading pop-up windows:
There are two ways to detect this:
The HijackThis log is clean. Go through what I have given above to check on Firefox. See if you have a bad version. Let me know.