Clean Up Unwanted Files

Get a good program like CCleaner, which can remove temporary system files and internet cache files. This can potentially free up a lot of space on your hard drive. CCleaner can be found here. Beware of bogus programs, and stay away from those which need you to pay.

Defragment Your Hard Drive

Defragmenting your hard drive moves all the files into the front of the drive, so when you need to access something on it, or save something, it will be faster. You won't see changes in the location of your files and folders, only differences in speed. Windows Defragmenter can do the job, but there are some free ones which you may want to look for. Defraggler is a trusted free defragmenter, and can be found here. Once again, beware of fake programs which may be viruses.

Make Sure You have Antivirus Protection

A lot of reasons for a slow computer are caused by viruses and malware. Be sure you have a reputable antivirus, which does not slow your computer down. Many free ones can do the job just as well, and even better, than paid antivirus programs. A great free antivirus is avast! which can be found here. Make sure you only have one antivirus, as many could conflict with each other, and slow down your computer. Like every other program, beware of viruses and fake antivirus programs.

Firewall

A firewall is optional, but not necessary, as most antivirus programs come with some form of firewall.

Antimalware and Antispyware

Malware and spyware sometimes can't be found by your normal antivirus. There are some programs which can find these and should be run around once every month. They serve as scanning programs, and shouldn't be used as antivirus or firewalls. Some recommended antimalware and antispyware programs are Malwarebytes AntiMalwareSuper Antispyware. Be aware of fakes which can pop up often. and

Safe Surfing

It is good to practise safe internet surfing, which includes not visiting websites which you do not know of. There is a good addon for the Firefox browser which has ratings on almost every site on the internet. It is called Web of Trust and can help you decide whether to visit certain websites or not.

Registry Cleaners

Stay away from all kinds of this. They usually cause more problems than they solve, so avoid using registry cleaners at all costs.

These should be practised often, and it would speed up your computer and keep it free of malware and spyware. This will ensure your personal files are safe.

清理不需要的文件夹

弄个好点的程序，如CCleaner,它能够清除临时系统文件和互联网快取档案。这样做将能够释放你硬盘上很多潜在的空间。CCleaner 可以在这里找到。小心假冒的程序，并且远离那些需要你付费的程序。

清除你硬盘的碎片

硬盘碎片清理将会使所有的文件移动至硬盘的前端，所以当你需要存取其上的任何文件时，这将会变得更快。你不会看到你的文件和文件夹位置的变化，只会看到速度的变化。Windows Defragmenter可以完成这项工作，但是还有一些免费的软件，你可能想看看。Defraggler是一个值得信赖的免费的碎片清理程序，可以在这里找到。再次提醒，小心那些有可能带有病毒的假软件

确保你有杀毒软件的保护

使电脑速度变慢的很多原因是由于病毒和恶意软件所引起的。要确信你有一个信誉好的杀毒软件，其将不会减慢你电脑的速度。也有很多免费的软件可以做这项工作，而且甚至比那些付费的杀毒程序更好。有很多免费的杀毒软件！其可以在此处找到。确保你只有一个杀毒软件，因为许多杀毒软件之间会相互冲突，并减慢你电脑的速度。向其他程序一样，小心病毒和假冒的杀毒程序。

防火墙

防火墙是可选择的，但不是必要的，因为大部分的杀毒软件都带有某种形式的防火墙。

防恶意程序软件和防间谍软件

恶意程序和间谍软件有时不能被你的普通杀毒软件找出。有一些程序可以找到这些恶意程序和间谍软件，并且应该至少每月运行一次。这些程序担当扫描程序的任务，而不应该被当做杀毒软件或防火墙来被使用。推荐一些防恶意程序软件和防间谍软件Malwarebytes, AntiMalwareSuper和Antispyware.注意会经常突然出现的假软件。同时，

安全浏览

实行安全浏览时有好处的，这包括不访问你没听说过的网页。Firefox浏览器有个很好的功能，其几乎给所有的互联网中的网页评了级。它被称作信任网，其可以帮助你决定是否访问某些网页。

注册表清理软件

远离一切此类的软件。这些软件，与他们解决的问题相比，通常产生更多的问题。所以，无论如何都要避免使用此类注册表清理软件。

这些建议应该经常被实施，这将提升你电脑的速度，并且使其摆脱恶意程序和间谍软件。这将确保你私人文件的安全。