Hi omicron_persei8,
Was the browser working before you have installed Java?
What else is not working?
We can try few troubleshooting to find out what is causing slow computer performance.
Create new user account and see issue resolves within new user account if it does then your user account is corrupted.
Please follow my instructions at my tutorial to boost performance of Windows OS.
"Tweaking & Optimizing Window Operating System"
http://www.geekpolice.net/t30298-tweaking-optimizing-windows-operating-system
I would like you to check the system integrity of your Windows OS installation.
- Please right click the Windows logo (formerly the start button) at the bottom left of your screen.
- Please select "Command Prompt (Admin)"
- Please type the following command and press the key: sfc /scannow (Please note that there is a space between 'sfc" and "/scannow".)
- It should take about 20 minutes to run, if there are no serious errors.
- If the System File Checker reports that some errors were fixed, but some remain; please reboot your computer and run the System File Checker from an Administrator Command Prompt, again.
- If the System File Checker again reports that some errors were fixed, but some remain, please reboot your computer and run it a third time.
- If "Resource Integrity Violations" (errors) are reported that could not be corrected, or were not corrected after a third SFC run, then please navigate to the folder: C:\Windows\Logs\CBS and copy the file "cbs.log" to your desktop immediately. I am asking you do that because that file is dynamic, so I want to be able to examine a copy that is unchanged from the time that the System File Checker was run.
- If there are errors that couldn't be corrected, let me know and I will provide you with instructions as to how to upload the file
If the issue is caused by a current running process, restart your Windows system using the
clean boot method which will allow you to troubleshoot if a service or process is causing the issue to appear.
With a clean boot only the necessary services and process that are required to operate Windows are started when you boot your computer.
Follow the steps at below link to perform clean boot state.
"Clean Boot Windows"
https://www.dost-tech.com/viewtopic.php?f=10&t=109