More often than not I check my computer in the morning after the scan is completed and the desktop background picture is gone and the Windows Theme is changed from Classic to Classic (Modified). Is this normal?
I can't say it is, but it sounds like this is intermittent from your post when your machine boots back up...is this correct?
May I ask why you are doing a boot scan so often? We only recommend doing a boot scan only if you find or suspect a problem. Normally most users do a Quick scan weekly or less, and a Full scan monthly (depending on your usage or what you use the machine for), but a Boot scan if you find an infection or suspect a problem. Remember, Avast is always running in the background and scanning things...unless you disabled something on purpose like a Real-Time Shield. So there really is no need to do this Boot-time scan so often.
Regardless, we still need to figure out why your desktop is changing after doing a boot scan.
1. What version of Avast did you install? Be specific 6.0.?
2. What product of Avast did you install? Free, Pro, AIS?
3. What other security software do you
currently have or did you have
in the past on this machine including:
- Antivirus (AV)
- Firewall (FW)
- Trial versions of AV, FW and other security programs
- Other security software
- If they were in the past, how did you remove them (the vendor's uninstaller's tool or another way)?
4. Are your other software and MS Updates current?
5. Have you done any Avast scans (Quick, Full) and if so are you clean?