Time to clean up the old and make way for the new.

Start with your computer.

For FireFox under Tools select Clear Recent History and click ClearNow.
For Internet Explorer - Tools- Delete Browsing History and click Delete


For Windows using the Start ICON choose Accessories under All Programs then choose System Tools and then choose Disk Cleanup and run it. After that you’ll want to run Disk Defragmenter, also found in Accessories-System Tools

I use Disk Cleanup but I also use CCleaner and Defraggler. Both are free. CCleaner installs an option on the Recycle Bin to run it from there and that includes emptying the Recycle Bin as part of the process.

CCleaner is the number-one tool for cleaning your Windows PC. It protects your privacy online and makes your computer faster and more secure. Easy to use and a small, fast download.
http://www.piriform.com/ccleaner/features

Use Defraggler to defrag your entire hard drive, or individual files - unique in the industry.
When Defraggler reads or writes a file, it uses the exact same techniques that Windows uses. Using Defraggler is just as safe for your files as using Windows.
http://www.piriform.com/defraggler/features

Make it a weekly or monthly habit.