Bad Virus

I have a virus that does not let me on the internet, open files or anything as it says my computer is at risk you should download this software. It is very obstructive and I cannot do anything really. Am i infected or is it just a trojan for now.
I can scan with avast but it goes crazy, the icons in the bottom right multiply rapidly, things open tellign me to download and obscene websites come up.
HelP!

Are you using Windows XP/Vista/7?
Can you schedule a boot-time scanning?
Start avast! > Right click the skin > Schedule a boot-time scanning.
Select for scanning archives.
Boot.
If infected files are found, it’s safer to send them to Chest instead of deleting them.
This way you can further analysis them.

You’ll need further cleaning operations, like checking your hosts file, fixing your connection, etc. But let it for a second turn.
After avast, install and run MBAM for a second cleaning.

what is a boot time scanning?
also whenever i start avast about three new windows open asking me to download anti virus software? is this expected of a virus?

I would go with the MalwareBytes program first, that Tech suggested. What is the name of the rogue program that pops up on your screen
http://filehippo.com/download_malwarebytes_anti_malware/

Boot time scan http://www.digitalred.com/avast-boot-time.php

they all come up as windows security alerts.
maybe win32?

Have a look at this link steps 3-6 only This may help you regain your internet, then try the MBAM program,if you have problems installing / running post back http://www.bleepingcomputer.com/virus-removal/remove-antivirus-system-pro

why can’t i use avast to kill it?

Oh god, why do I bother ::slight_smile: