Should i install CFW 5?


I have been using Comodo Firewall from 3.0 on my laptop. Very satisfied.
I have a desktop for the bigger stuff like OpenCL and games and more like that.

I did install CFW 3 on that machine and it was not like i expected. Boot imes went from 5 minutes to 45 minutes. I believe it was the early edition of the 64 bit version of CFW.
I used a legal Kaspersky on it for a year. But i found it too heavy for my machine as it slowed down gaming experience. I need those resources. Kaspersky off and all was well, but unprotected
When the license expired, i did not extend it.
Instead i went for Windows Firewall and Microsoft Security Essentials.
Very smooth, but am i protected enough?

I keep reading “windows firewall is terrible”.
So my question is: Should i install the new CFW 5 x64 on my gaming rig? of is it overkill/too heavy and likely to slow performance down.

Vista Ultimate x64
Q9550 @ stock
6GB mem

Firefox with no-script
Windows Firewall as firewall
Microsoft Security Essentials as AV
Malwarebytes’ Anti-Malware as on demand scanner only

I do not download or use illegal stuff, i do not surf for adult material. i only use legally bought games and programs. Or open source (Blender, Inkscape).

Would you recommend me to install CFW5 along side security essentials?