Security software recommended by Bank

I have just opened an online account with my Bank, having been a customer for many years.  They recommend that I install anti-virus software which they provide. I know nothing about it. It is called Trusteer Rapport.  Via Chat a Norton advisor says:"We actually do not recommend that you have multiple security  software installed on your computer because it will cause conflict with the scans and it will slow down your computer." A standard response I presume. Does anyone have any knowledge of it and any advice?  The Bank say it will not conflict (my main concern) or slow down my Tablet PC.

clayto