raman
5
Whats the (exact) name of the file reported as infected? you can rename it by using the Windows Explorer and start your PC again. Or use/start MSCONFIG.EXE and disable the file under Systemstart.
Or you can download ad-aware from www.lavasoftusa.com install it/update it and let it do the work. Or start the taskmanager(press CTRL+ALT+DEL together) end/kill the Trojan process(it should have the same name than the infected file), start Avast and let it delete or rename it.
BTW: Does the Homeedition not support the Move/rename option?