this is my first post here, and I will try to follow instructions listed in "Before You Post About A Problem".
1. Using a topic title that explains the problem
black screen and moving cursor
2. Explain your question or problem with as many details
a friend of mine asked me to clean his PC from malware/viruses.
I installed free AVIRA antivirus 2014, searched for viruses, deleted bunch of them. Additionally I ran CCleaner, deleted a bunch of other error files, etc. I did not backup anything. After restarting, I (and apparently many other users) have a problem - black screen and moving white cursor.
Computer boots normally, I enter password for Win7, then it goes to completely black screen, only mouse cursor visible. I can move the cursor, but left/right buttons are inoperable. Pressing Ctrl+Alt+Delete leads to a MENU where you can choose to LOCK PC, CHANGE PASSWORD, RUN TASK MANAGER, TURN PC OFF. However, TASK MANAGER does not work.
Safe mode leads to the same result - black screen, except for "SAFE MODE" message on the 4 corners and MICROSOFT ® WINDOWS ® (BUILD 7601:Service Pack 1 message on top center.
3. Advise what operating system
PC - Acer ZC3, Ferrari 5000 series
OS - Windows 7 (in Russian), 32 bit.
4. Include any steps you have taken already to fix your problem
Unfortunately, i dont have a repair disk. But pressing F8 after BIOS I can access ADVANCED BOOT OPTIONS. Choosing 1st option (REPAIR YOUR COMPUTER) leads me to SYSTEM RESTORE menu with 5 options. Pressing 1st option starts scanning PC for errors, reports 'no errors found'. 2nd option says 'no restore points found'. 3rd option says 'no system image found'. 4th option scans PC memory, finds no errors. 5th option is more interesting - command line.
From there I learned, e.g. windows drive is on d: (and not on c:), I can see my friend's files are alive. DIR C: command says "drive C is reserved by the system".
Running SFC /SCANNOW does not really scan but instantly says that I need to restart the system to restore files. Restarting and repeating SFC /SCANNOW leads to the same loop.
After that, I ran a complete scan using Kaspersky Rescue Disk 10 (using USB-boot). This software found / quarantined / disinfected / deleted hundreds of more viruses / malware. Interestingly, Kaspersky Rescue Disk shows that system files are all on C:
However, all these steps did not resolve the issue.
5. follow the rule: one problem, one post
Problem: PC does not get any further than a black screen.
6. Double check the information
7. take the time to read what you are posting
I tried to provide all the details, and double-checked. But if there is anything missing I am more than glad to reply.