Shh, please don't shout.
Start- Run - Msconfig - start up tab. This will show you everything that starts when Windows starts. Untick all but your anti virus, reboot.
Look for Ccleaner - download and install - Run the Cleaner section, then Registry, then look through Tools, installed programs - uninstall any you don't use. Run registry again, run cleaner again - reboot.
I can't recomend any of the so called "optimiser" programs, haven't found any that have done the trick and too many have led to malware being installed on the PC and thereby slowing it down. I fix computers on a part time basis and a lot of my time is spent removing these so called optimiser programs and removing the browser hijackers they install so be very careful what you download.