Wednesday, November 20, 2013
A clients computer kept freezing when playing facebook games. When I realised that these games used flash I realised that I had seen something similar with Youtube videos on some computers. The problem is when flash is setup to use hardware acceleration. This is not compatible with some graphics cards. this can sometimes be solved with using the latest version of flash and updating the graphics drivers to the latest version. If this still doesn't work you can right click on the game/video which brings up the flash context menu. Select settings and the following screen will appear. Deselect the tick next to "Enable Hardware acceleration" which should stop the crashing.
Note that with most modern computers there will not be any noticable reduction in performance.
Tuesday, November 12, 2013
A virus with the same visual style can be very different under the hood. A client had the AFP virus which shows the typical white screen with black writing warning the user that they will be turned over to the Australian Federal Police unless the pay usually $100 via UKASH.
They delivered the computer last Saturday afternoon and I thought I could clean the machine in an hour as I normally do. The computer gave me access via Safe Mode and I tried to run Combofix (I downloaded it on another computer). Unfortunately Combofix froze and then I tried Malware Bytes which didn't pick up any issues.
I then manually cleaned the machine. I used msconfig to identify the virus components. I unclicked them and then went to the folders and removed the files.
As it was an XP machine I looked for files in "Program Files" and in the settings area in "c:\programs and settings\
These viruses also usually install a driver so I started up device manager and clicked on "Show Hidden Devices" and in the non-plug and play section I recognised the virus driver and removed it.
This allowed me to start the computer normally except the taskbar did not come up. This is usually a problem with explorer. After trying a few things I went in the registry and noticed that the setting:
had cmd.exe instead of explorer.exe. I fixed this setting and the computer booted normally. As for Combofix, I think that it froze because the client had 3 anti-virus programs running simultaneously.