I Think I Have A Hacker and my internet privacy is being invaded

[EphesiaNZ]

If you reinstall your operating system you'll lose all of the information on your hard drive. Any pictures, documents, programs that you have on there will be erased.

Not if you do a "GOOD BACKUP" of your current data

Also, not to be condescending, but troubleshooting such a vague computer problem over a forum like this with someone of your skill level is almost impossible.

Sorting anyone's problems out over the Internet is at best a hit or miss affair at the best of time no matter what the skill level

I think you should take it somewhere to be looked at before you reinstall your operating system.

Although most average users have to do this at one time or another it could cost a good proportion of a new laptop to fix your current setup (if it ends in a reinstall) - one reason why the big PC makers (and Microsoft) make so much money out of those customers.