Your Windows 2000 Professional computer contains a 166 MHz processor 64 MB of RAM and 750 MB of free disk space. You have installed a number of applications on your computer including a word processing program， a spreadsheet program， a third party scientific application and a multimedia player. You notice that when you have several of these applications open simultaneously the performance of your computer is noticeably slower. You run system monitor notice that the processor time and queue counters are showing high readings was blue and red line touching 100%. What should you do to solve this problem？（）

• A、Use diskprode to modify existing disk sector values.
• B、Upgrade your processor.
• C、Increase the amount of free disk space.
• D、Increase the amount of RAM.