What would cause my computer to run slow?

[Daniel]

well i would say your computer has too much stuff heres some ways to clean it daily:
1. go to the bottom left corner click the button and type in "prefetch" and click enter and when the folder comes up delete evething from it and empty recylce bin
2. this is the same as # 1 but instead of prefetch type in "%temp%" but never put in the ""
3. all programs, accecories, system tools and click disk cleanup and click ok and then when the thing pops out after done scanning click ok and then delete
4. go to your main folder, its like the one with the name you made up when u got ur computer go to downloads and delete anything that you dont't need anymore ( this deleted like 4GB of unneeded stuff for me) and then empty recyclebin. if you want go on youtube and ull c