I can't get my firewall to work

[Sotanuija]

So I bought the new licence for year couple of days ago, then I noticed that my firewall wasn't on so I clicked to put it on. Well it said "Unable to start Firewall!" Does anybody know why it does not start?

And another was that when I bought the licence and updated Avast, my Keyboard stopped working but I have already resolved it.......

Thanks in advance.

[Asyn]

So I bought the new licence for year couple of days ago, then I noticed that my firewall wasn't on so I clicked to put it on. Well it said "Unable to start Firewall!" Does anybody know why it does not start?

Repair avast!:
1. Control Panel -> Add/Remove programs -> avast!
2. Click on 'Repair'.
3. Follow instructions.
4. Reboot.

[Sotanuija]

Well I tried this but it is still saying "Unable to start Firewall!" and on the top of that it made my keyboard stop working.....again, any other suggestions?
Thanks though for your reply Asyn.

[Para-Noid]

Try a clean install.
Download and save http://files.avast.com/iavs5x/avast_free_antivirus_setup.exe
                                http://files.avast.com/iavs5x/avast_pro_antivirus_setup.exe
                                http://files.avast.com/iavs5x/avast_internet_security_setup.exe
                                http://files.avast.com/iavs5x/avast_premier_antivirus_setup.exe

Download and save http://www.avast.com/uninstall-utility

Reboot into safe mode>Run uninstaller for each version of avast you have>reboot into normal mode>install the version of avast you selected
above>register(Free)/insert license (Pro, AIS or Premier)>reboot