Not easy to get singature update.

I don’t know why it is hard to get signatue db updated.
I am using wireless connection for accessing internet.
My download speed is around 0.89 Mbps from Comodo speed test page [http://speedtest.comodo.com/]

I receieve message of the following:
Please wait while the virus database is being updated.
This might take a few minutes…
Downloading: BASE_UPD_ENG_USER_v4453.cav[0 bytes/82.9 KB]

Then the window show me failed to update as following:
Failed to update the virus signature database.
Please check your internet connection and try again later.

Is the problem still actual?