my husband bought a new laptop (toshiba) and its all set up with windows etc. he has a trial with an antivrus program (not sure which) and its about to expire. last night i downloaded avast antivrus home edition to the laptop (stupidly didnt uninstall the other program first) now the laptop loads ok but i cannot access anything, not even the start menu. the whole thing just freezes if i try and click on any icon. i cant therefore uninstall avast. have tried rebooting, with and without the wireless connection, and have also rebooted the router. still no luck. can anyone advise me what to do?