Try this:
select count(ID) as Count from
(
select top (1) filelogid as ID
from customerloanocr
with (nolock)
where assignedto = 1
AND createdon between '2014-01-01 00:00:00' and '2014-04-04 00:00:00'
and processed = 0 and isnull(deleted,0) = 0
AND isnull(DELETED,0) = 0
order by id asc
) as subTable