I recently had to wipe my hard drive and start fresh. Prior to wiping my computer was running terribly slow, sometimes not at all. I downloaded mozilla firefox browser and it seems to be much faster. I also downloaded avast to use as my antivirus. I tried zonealarm for my firewall but had to take it out as the computer slowed right down again. Did I do something wrong with the installation or is there a firewall that anyone would recommend?