i download clamav*.rpm from rpmfind site and while installation i am getting
these error

[shyamala@students ~]$ rpm -Uvh --nodeps clamav-0.88.4-1.fc3.i386.rpm
warning: clamav-0.88.4-1.fc3.i386.rpm: V3 DSA signature: NOKEY, key ID 1ac70ce6
error: can't create transaction lock
[shyamala@students ~]$

i want to scan the file from php, for that only i went to clamav

how i can install this? or is there any other way for installation