I downloaded avast free antivirus. But i thought it was free it said i have 30 days of protection. Why isnt avast free free? ??? 
It is FREE but you need to register 
and after one year you repeat it, andâŚ
On-line registration is very simple and itâs the preferred method for all users of avast Free Antivirus 5.0 installed on a computer with standard Internet connectivity. To perform on-line registration follow these steps:
http://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=459
Wow thanks 
Im just in a rush. So thanks for the help.
Wait i have another question. In the avast settings it said enable raw disk access during boot time scan. How do i do a boot time scan and what does raw disk access mean?
If you open Avast!, Boot-time scan should be in the âScan Computerâ section.
I would think âRaw Discâ would mean it scans the HDD from front-to-back, without paying any mind to the type of file system used on that HDD (NTFS, Fat32, etcâŚ)
Hi ieattacis, raw disc access should be ticked by default so that avast can scan before anything else starts. To set up boot scan click the scan computer tab then click boot time scan and clik add button, use the drop down button to pick all harddiscâs then add then pick system drive and add then all you have to do is click schedule now and when you reboot next it will do a boot time scan. Best to leave all huristics set to normal and this scan will take a long time so not advised to do every reboot, only needed if you think that you might have an infection that normal scanning isnât removing like root kitâs.