BleepingComputer.com: Do these programs work well together

Hi all,

Is anyone aware of anything in the following combination of programs that would result in one blocking the effectiveness of another:-

Ad-aware
Spybot Search & Destroy
Spyware Guard (real-time protection disabled)
Spyware Blaster
WinPatrol (for those rare occasions IE is used)
Microsoft Antispyware Beta (take over real-time from Spyware Guard)

Assume these compliment an AV program, Firewall, a variety of occasionally run programs like stinger or CW Shredder etc. The machine will be running Xp(SP2) and the default browser 'Firefox', default mail client 'Thunderbird'.

The background to the question is that whilst I'm happy with the various layers on my PC (although since Microsoft's Antispyware I'm not sure Spyware Guard is necessary anymore ?) I have now to set up my Mother's new machine. So I need to help protect her machine without burdening her with any unnecessary duplication.

Bearing in mind that the machine in question is to be used for on-line banking amongst other things I must err on the side of caution. That being said - I'd welcome any advice, observations about the above combination.

Thanks for taking the time to read