PC has been behaving oddly on startup for a while and I was therefore highly suspicious, but Norton found nothing time after time, nor did Trend Micro's online scan. However a similar online scan from Kaspersky discovered Trojan.Win32.Golid.g but gave me no options for dealing with it, It also said the file was C

WINDOWS\system32\ExMenu.dll
Google gives only limited and unhelpful results so my question is can anyone please help me deal with this little pest or can I just locate and delete this file?
Dell Dimension PC, WinXp SP2, AOL 2 Meg BB, NAV, MacAfee Firewall, Netgear Firewall Modem Router
Many thanks
mcdhu