I been paid for anti virus but its not fix yet

What do you mean you have been paid for antivirus ?
or is it i paid for an antivirus and it has not fixed my problem ?
There are plenty of freeware antivirus programs available on the internet and even microsofsts own security essentials
if you are unable to start your computer try starting in safe mode
Restart your computer repeatedly tapping the f8 key to enter safe mode while the screen is black once in safe mode where the only things working will be your keyboard and mouse allowing you to attempt to repair your computer

Reboot the computer As the computer is booting repeatadly press the F8 key as the computer is booting
If done properly the user should get to a screen similar to the below screen.
Select the option for Safe mode command prompt only
Windows Advanced Options Menu
Please select an option:
Safe Mode
Safe Mode with Networking
Safe Mode with Command Prompt
Enable Boot Logging
Enable VGA mode
Last Known Good Configuration (your most recent settings that worked)
Directory Services Restore Mode (Windows domain controllers only)
Debugging Mode
Start Windows Normally
Reboot
Return to OS Choices Menu
Use the up and down arrow keys to move the highlight to your choice
select the safe mode option
then run your antivirus if still cant get rid of the virus restart again
Use the up and down arrow keys to move the highlight to your choice.
select safe mode with networking download anti malware and microsoft security essentials
http://www.microsoft.com/en-us/download/virus-malware.aspx?q=virus
anti virus and malware
http://windows.microsoft.com/en-US/windows/products/security-essentialsonce you have your computer running or you could do this in safe mode
Press windows button and in the search type msconfig go to startup tab and uncheck those you dont want to start.
Scroll to the bottom toolbar bottom of screen right click you can select task manager applications also processes you will see whats running on your computer and ticking over you might still have a virus
If you see something running that you does not need to be running select end now then you might you might uninstall that particular program
and some unnecessary programs
you should also check leads from motherboard to hard drive for secure dust free connections
Click start control panel administrative tools computer management disk management right Click on your drive select properties click tools you should see click check now
click start tick in both boxes this will schedule to on restart
have no input while chkdsk utility is in progress any might damage your operating system and your computer
Windows 7 chkdsk
http://www.w7forums.com/use-chkdsk-check-disk-t448.html
also you might download and use this 360 amigo and jetclean both are freeware totally free to use
http://download.cnet.com/360amigo-system-speedup-free/3000-18512_4-75206713.html 5E3422139C19CBED35C14826A44D4605
Improve your PC performance and fix errors.
http://download.cnet.com/jetclean/3000-18512_4-75627788.html
JetClean tidies your registry, gets rid of junk files, deletes broken shortcuts, and attempts to give your computer that like-new feel again.
then defragment your hard drive.