High RAM usage while idle

I just upgraded from Vista to Windows 7 a few days ago and ever since then, my RAM will jump from 39% to 99% within 1 1/2 hours and becomes sluggesh to the point where I cant hardly do anything. I never had this problem with Vista. I've searched and search and saw all types of topics related to this, but did not give me an answer to this.
Also since I installed Windows 7, everytime I reboot, I get this black screen that says its checking my :C for NTFS or something like that and it will not go away...ever, unless I reboot it again and press some keys within 10 seconds.

My system specs (Alienware Mx17 laptop)

Processor: Intel Core 2 Quad CPU Q9000 @ 2.00GHz
RAM: 4.00Gb (says 3.75Gb usable)
System Type: 64-bit Operating System

Graphics: Nvidia GeForce GTX 260M (SLI)
Nvidia GeForce GTX 260M (SLI)
Nvidia GeForce 9400M G

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First you should run through the logs that are listed in the link in my tagline for how to identify your problem.

You probably have software that is loading and it's either setup like Setti or the Folding software that usese your free cpu cycles,.... or you have a program that runs but has a memory link... if you don't mind I would like you to test this before you make any fixes... when it's starting to increase your memory... and get back to me. Thanks

Running multiple
applications simultaneously in Windows leads to a gradual decrease in system
performance over time. Often the only solution is reboot or use a third party
memory optimizing program. Even if you close the application the tasks/threads
associated with the application are not released completely, depleting the
system’s memory resources making the system unstable and sluggish.

Follow the below steps to create shortcut for optimizing memory. Right-click on
your desktop and Select New > Shortcut In type the location of the item path:
Enter below information
%windir%\system32\rundll32.exe advapi32.dll,ProcessIdleTasks

Click Next and give it a name like "Optimize Memory" and finish
. Whenever your computer is sluggish - not responding to your
commands at the usual speed, run this command and it should free up the system.

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