I do not recommend that you use any Registry Cleaners, Optimizers, Driver Updaters, Tune -Up utilities, etc.
They may do more harm to your operating system than any good that they claim to be able to do.
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See if this assists you to improve performance.
Scan for Malware with the FREE version of this Program.
Download, install, update and scan your System with the free version of Malwarebytes AntiMalware:
http://www.malwarebytes.org/products/malwarebytes\_free
And disable the Premium Trial and set it to the permanently free on-demand version:
https://support.malwarebytes.com/docs/DOC-1033
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You can clean up your Hard Drive using these two methods.
Tips to free up drive space on your PC
https://support.microsoft.com/en-au/help/17421/windows-free-up-drive-space#delete-files-using-disk-cleanup=windows-7
Using the Free CCleaner Program:
http://www.piriform.com/ccleaner
Under NO condition use the Registry cleaning Option in CCleaner
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And it is not recommended that you use ANY Registry or Cleanup/TuneUP/Utilities Program as they may do more harm to your Operating System than any good that they claIm to be able to do.
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Make sure that you have the latest updated Drivers:
Go to your Computer or Hardware Manufacture's website > Driver and Software Support Section > look up your Computer or Hardware Model number > then your Operating System > locate the correct Drivers > download and install them.
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These are other steps to follow, which does include some of the above:
"Optimize Windows for better performance"
http://windows.microsoft.com/en-us/windows/optimize-windows-better-performance#optimize-windows-better-performance=windows-7
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It would be a good idea to also run the System File Checker Tool just to make sure everything is correct in the System Files.
How to Repair Windows 7 System Files with System File Checker
SFC /SCANNOW Command - System File Checker - Windows 7 Help Forums
- Open an elevated command prompt. To do this, click Start, click
All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator. If you are prompted for an administrator password or for a confirmation, type the password, or click
Allow.
2. Type the following command, and then press ENTER:
sfc /scannow
The sfc /scannow command scans all protected system files and replaces incorrect versions with correct Microsoft versions.
Cheers.