how to fix all errors and speed up my pc

i want to speed up my pc and clean it up from all errors what should i do? i;ve tried to scan it with regisrtry reviver but it won't fix all the erors cause i don't have licence key
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2 Answers

If you have an illegal copy of your OS then you should expect problems.  You won't be able to get the latest security updates and will be prone to have problems with viruses, spyware and malware.  You should purchase a new copy of the software and do a clean install.
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i want to speed up my pc and clean it up from all errors what should i do? i;ve tried to scan it with regisrtry reviver but it won't fix all the erors cause i don't have licence key
 
 
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