Excessive CPU Memory from Intercheck ? Anything to stop this ?

I have installed Sophos Anti-Virus version 7.2.3.2000C on my MacBook 13 2.4 Ghz Intel Core Duo running Mac OS version10.6.6.

Since the installation, I have noticed that in Activity Monitor app, "Intercheck" has been having high memory going up 300 MB in Real Memory and 350-400 MB in Virtual Memory.

I have also turned Off On-Access scanner to see if "Intercheck"  will leave or reduce in Real Memory and/or Virtual Memory but "Intercheck" still appears in Activity Monitor.

I have read several posts on the board but found no solution to end this problem. I have some posts as well in http://http://openforum.sophos.com/t5/Sophos-Anti-Virus-for-Mac-Home/Excessive-CPU-and-Disk-from-Intercheck/m-p/1231 but nothing came out of it.

Does anyone have any solution to fix this or end ""Intercheck"  ? Do I really have to uninstall the program and find some other app ?

Thanks in advance for your help,