Boot up timing slow?

hello guys i am new to this forums and i am sure this windows 7 forums can help my problem.
anyways my reboot timing is 147 seconds.
so the problem i have is why does it take so long to boot up my pc?
from the moment i press the ON button button to the time it completes loading my desktop. and the thing that takes soooo long is the Welcome screen. after i log in it, says "Welcome..." then the mouse point turns into this circle thing from vista (not the problem of the icon but how long it takes to boot) and it takes like 40 seconds from the welcome screen to the desktop and desktop takes like 20-30 seconds to load everything.
i just upgraded from vista to 7 yesterday and my vista boot time (from power on to desktop) took me 75 seconds...thats half of the time it takes me to boot my desktop.
any suggestions on how i can speed my laptop booting time??

thanks. i will look into that. right now i am running disk defragmenter. i heard this helps alot.
right now i have 2GB ram/250 GB hard drive

so anyways i have another question...how long does it take for your pc to boot?
from the moment you press the power button to the time your desktop is fully loaded?

at least it runs more faster than my pc -.-
well im just doing the things on the list that you told me about on the link. and then will check boot up time

i have disk clean up utility up and i was asking you since you seem to be a professional at this stuff, what should i check for the disk to clean up
here is what it says:

Downloaded Program Files 0 bytes
Temporary Internet Files 545 KB
Recycle Bin 0 bytes
Setup Log Files 260 KB
Temporary Files 0 bytes
Thumbnails 8.02 MB
Files discarded by Windows upgrade 612 MB
Per user achived Windows Error Repo... 150 KB
System achived Windows Error Repor... 27.0 KB
System queued Windows Error Reporti... 63.6 KB
Windows upgrade log files 437 MB


which should have a check in the box for disk clean up?

to be extra cautious can i set a restore point before i do the disk clean up (all boxes checked) just in case something happens after?
sorry if i happen to be a noob to this lol