Why do I need to restart to get full Down/UP speed?

A few months ago, I played with my services and sped my (Desktop) computer up. I'm not exactly sure what I did, but when I start up my computer (aka cold boot), my download speed doesn't even reach 1 Mbps. I forget what the upload speed is. My FiOS plan is 15 Mbps Down, / 5 Mbps Up. When I RESTART my computer, I do another speed test and everything is fine.

I recently changed from MSE to Bitdefender, but the problem started occurring before I migrated, so that's not the problem. Any suggestions what this could be?

My computer is wired to the router.

Please post the info requested here:
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You can set your services settings to the default settings detailed here:
» Black Viper?s Windows 7 Service Pack 1 Service Configurations

Then do a few speed tests in a row using this website:
Speedtest.net by Ookla - The Global Broadband Speed Test

Restart and repeat the speed tests a few more times.

Open Resource Monitor and select the tab named Network. That should let you see what apps are using bandwidth. Leave Resource Monitor open and keep checking your connection speeds via the speedtest website until you notice a drop in speed several times in a row. Then quickly check Resource Monitor to see if some app is hogging your bandwidth.

This is not a perfect test since there are ways for apps to hide themselves from Resource Monitor... but it is worth a shot.