Error occurred trying to update4.6

Everytime avast tries to update instead of the usual blue window popping up over the system tray, I’ve been getting a red one stating the following:
AN ERROR HAS OCCURRED WHILE TRYING TO UPDATE!
CLICK HERE FOR MORE INFORMATION
but when I click on it , it simply disappears back down into the task bar! I went to the web site to D/L it directly and it D/L’ed successfully or at least it said it did but on install, it immediately brought up a window stating:
CAN’T INSTALL VIPS UPDATE. PLEASE,REPORT FOLLOWING ERROR CODES:
VERSION 4.6.691
SI: 0x00000002
ST: 0x00000002
LE: 0x0000000

Any suggestions of what I do now? Help, please!

Please use the search option on this board.

What is your firewall?
Does it allow access for avast.setup, if not no updates.

Stephtx59, did you update avast! before?
Can’t you update now, manually?
Which firewall do you use?