Vista - Printer goes offline even after installing vista service pack 1

Hi,

Previously I had problem with my network printer. It had gone offline. Anyhow after browsing the web I understood that I should install service pack 1 for Vista (KB936330). I did and my problem was solved. Today, the Windows automatic update installed some updates and asked me to restart my computer (to me it means that the update was something important!) However, after this I found out that again the previous problem has been occurred and the printer again has gone offline. Now nowhere I could find a solution for that because everyone say that I should install service pack 1, while I've already installed it. I would rather not to reinstall the printer's driver because I have no access to its driver.
I'm using Windows Vista Business 32-bit on a Fujitsu-Siemens Tablet PC with Kaspersky Antivirus. If giving more information can help me to address my problem I will shoot; just let me know.

Great thanks in advance for everyone, who can give me a usable suggestion.