My computer is laggy and tries to crash

[deadlegion]

Another to thing to possibly check (if you're using firefox) is your plugins/extensions.
Although if your computer is crashing and sluggish without even using a browser then this is probably irrelevant

There a few things that if installed and enabled, are vulnerable.

Like:
Java Platform...disable if vulnerable or update.

Shockwave Flash...older version is vulnerable and should be disabled, update to the latest version and it should be ok. You need this plugin for embedded vids and crap.

Adobe Acrobat PDF plugin...older versions are vulnerable iirc. Disable if vulnerable or update.


As a final note, don't have heaps of plugins/extensions for firefox 'cos it's a resource hog without them anyway.