nor worse .... just not as good
if it is your scanner .... or it could just be windows - obviously the more there is ... the longer it will take - and 40 - 160 is a big jump.
and presumably - if the original disk is 40 - it's not going to be the fastest
a min isn't bad (mine takes more) - the main thing is what it's like when it's running.
download
http://www.ccleaner.com/download
run it once a month or so - defrag and check for errors every other month ... and keep the disk with at least 20% free space (shift photos and music to dvd or a usb HDD)512 - don't go mad
if your RAM is less than 256 - consider that as your next upgrade
increase to 256 or 512 - but don't go mad too much ... and you could slow things down
and that's as much as you can do