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My PC is so unresponsive and slow its unusable!!

So. Ive had my PC for about 2 months now, received it from my cousin.

Im not very tech savvy, but its got 12gb of ram, 4gb memory and runs on an i5 processor.

Its been perfect up until a skype call a few days ago when i shared screens. It has progressed until now where everything is completely unresponsive!! My mouse will sketch around the screen, programs will take up to 2 minutes to open, like a simple google chrome tab. Its just gone to ****!! Ive gone into task manager and noticed that my ram is capped at idle? I have no programs open, yet i have 0 of 12gb of ram free, its all being used on nothing. Have I got faulty ram?

I really need help, need this pc for gaming and Uni, please help boys.

Jayden.

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Re: slow

I'd start with system restore back to before that fatal skype call.
If that doesn't help, go back to factory conditions (reinstall Windows).
If that doesn't help, it's a hardware issue, but that's unlikely.

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Delete temp files, Background programs
Reboot

If your computer has not been rebooted recently, make sure to reboot it before following any of the steps below.

Background programs

One of the most common reasons for a slow computer are programs running in the background. Remove or disable any TSRs and startup programs that automatically start each time the computer boots.

Tip: To see what programs are running in the background and how much memory and CPU they are using, open Task Manager. If you are running Windows 7 or higher, run Resmon to get a better understanding of how your computer is being used.
If you have an antivirus scanner on the computer, spyware protection program, or another security utility, make sure it is not scanning your computer in the background. If a scan is in progress, it can decrease the overall performance of your computer. If this is the case, allow the scan to complete, and the computer's performance should improve.
Delete temp files

As a computer runs programs, temporary files are stored on the hard drive. Deleting these temp files can help improve computer performance.

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