Uninstall windows spywall as this is outdated.
A more thorough on-demand malware scanner is MBAM:
To check your computer for malware with Malwarebytes’ Anti-Malware (MBAM).
· Download
free http://www.malwarebytes.org/ for an on-demand scanner.
· Double Click mbam-setup.exe to install the application.
· After install, click
update so you have latest database before scanning.
· Under Settings:
o
General: Automatically Save File After Scan Completes is checked off
o
Scanner Settings:
Check all boxeso
Updater: Download and install update if available is checked off
· Once the program has loaded, select "Perform FULL Scan", then click Scan.
· The scan may take some time to finish, so please be patient.
· When the disinfection scan is complete, a log will appear in Notepad and you may be prompted to Restart. (See Extra Note).
· Click the “
remove selected” button to quarantine anything found. You will find the infection details under the Quarantine tab.
· The log is automatically saved by MBAM and can be viewed by clicking the Logs tab in MBAM.
·
Copy & Paste the entire report in your next reply.
If MBAM encounters a file that is difficult to remove, you will be presented with 1 of 2 prompts -- Click OK to either and let MBAM proceed with the disinfection process; If asked to restart the computer, please do so immediately.
After your initial full scan, Quick Scan will do fine....just remember to always do an MBAM update PRIOR to scanning.
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As for XP firewall (FW), this only provides 1-way protection...not very good. You need 2-way protection. I suggest a third-party FW. Some that have been suggested on the forum as having no conflict with Avast have been PC_Tools_Plus_FW; Online Armor; Comodo w/D+ (meaning no AV); Outpost. There have been reported problems with Ashampoo and some with ZA.
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Re Add-on's: NS is good. You may want to add the following: BetterPrivacy (gets rid of LSO's including Flash); AddBlockPlus to start. Do this after we fix your problem.
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Before I get into other things, let's see if uninstalling windows spywall and checking your system for malware with MBAM fixes your problem. Please post back.