Help! Do I really need a dual boot?

Have you tried uninstalling ITunes unneeded Bonjour service? It can mess with Win7.

Can you fill in your System Specs in lower left corner of post?

Machine: HP Pavilion DV4-2016 (la)
OS: WIN7 Home Premium 64-bit
CPU: AMD Turion II Dual Core Mobile M500
Memory: 4GB RAM DDR2
Chipset: AMD M880G
Graphics: ATI Mobility Radeon HD4200

I see one issue. The Turion processors are generally considered very weak. If you need power in a laptop, go Intel. Aside from that, you still don't need user accounts, as they aren't going to do much for you. You just need to stop all the unneccesary junk from running at boot, like all the iTunes helper apps that aren't required. It's as simple as that. If that doesn't work, then you need to turn your attention towards hardware.

One thing i would try is downloading Ccleaner istfree and it cleans your computer of un-needed files and also it can change what boots with your computer so if apps. are starting up with your computer that you dont want to start with it then you can simply disable them. and also i would end and process that is not needed like as i gathered you use a laptop sometimes laptops run a process that controls your mouse (at least it says it does) but in reality it really just adds things like "preassure pad or mood pad" if you end that process then it could free up some space in your RAM and CPU to work. and also yes iTunes i think is a really un-needed program Windows media Play works just fine and you can find other programs out there to upload music to your iPod. it also takes up alot of CPU while running. also you didnt say what Ghz your CPU ran at could you please provide this information because there are some CPU's out there that can be overclocked without any problems.