Do i need anti-virus, spyware, malware and site advisor??

I have a new comp and am having so much trouble with viruses. I have avast anti virus (free). Pc spyware doctor (free) I have to manually start the scan for this. But is this ok and what is malware I also have mcafree site adviser. Is this all to much. My system is so slow but is that from the viruses i keep getting or the programs im running.

Do i need anti-virus, spyware, malware and site advisor??internet security software

you don't need all these much programs i will tell you a few and simple things to do to keep you away from viruses and spywares and won't slow down your pc

First to eliminate or avoid spyware problem use the mozilla firefox browser instead of internet explorer,the firefox is less attractive to spywares....use also the ad-block plus browser extension to block all ads and phishing that you don't like,firefox not only better in security but also faster and reliable and will increase ur browsing speed alittle bit.

Second,use NOD32 antivirus or F-Secure they are in the third and forth places of top ten anti-viruses,first one can detect 95,5% of viruses and second one can detect about 96.6 of viruses as i remember from many test has been done befor,avoid free programs like avg and avast they are good but only detect 88% of viruses.

3-use a free program to scan for spywares regulary such as ad-aware or spybot search and destroy they are the best of the best,not the best free but the best of all,the ad-aware can detect 99.5% of spywares.