There was a product update this morning on SAS for latest definition/core. After clicking the install setup and went thru the usual installation progress, Avira antivirus (version 10) detected a trojan during the SAS update. Antivirus gave me an option to removed and went by scanning and fixing the threat while SAS being updated. When update was finish, a system reboot was required for the changes to take effect. After rebooting the system and back again in Windows desktop, I chose to open SAS via shortcut icon and unusually an error occured that all files were gone/could not find(something like that). Went through program files and to my surprised, most SAS component files are missing. What I did was:
1. Uninstalled SAS by add or remove programs
2. Reinstalled previously downloaded version 5 installer.
3. Updated automatically and then another product update message pops out.
4. Went thru the product update install again, and it was a success.
Got worried there actually...