my pc

hi there i have a prob with my laptop
i have avast software and some sort of bug i cant get rid of
basicly i have try every think and im geting nowhere
first off the start menu kept comming up avast sorted this and it has now stopped
but also the e,t l,r x buttons dont do what they are ment to i did a boot scan and it seemed to fix it :-\ but no it was ok until i turned off my pc when i turned it back on it was back and tihs time after a boot scan its still there can anyone help thanks

Strange behavior… Are you using Windows XP?
I know it’s a generic answer but, can’t you scan your system with antispywares and antitrojans applications?
Ad-Aware, Spybot Search and Destroy, A-squared, Ewido or Microsoft AntiSpyware (freewares).
TrojanHunter or TDS-3 (sharewares).

If you run avast now (scanning archives also), do you see anything strange?