Slow starting this explains services you can dispense with to speed up boot.
But first delete files from internet cache and clear out the junk. Temporary File Cleaners:-
Crap Cleaner click here
Empty temp folders click here
Files waiting to write? Have you been dragging files to cd, if so recording may not be enabled:
my comp > cd:drive > properties > recording tab > enable recording on this drive.
If not then you may have a virus or spyware some freeones if you haven't got one:-
Anti Spyware :-
Adaware click here
Spybot S&D click here
Anti Virus :-
avast4 click here
Antivir click here
AVG antivirus click here