Ive been told to reinstall windows many times, i have important photos and files kept on my pc, i really cant trust myself to take a chance on losing important stuff, if its not a bother may i ask what a reinstall can do? and is there any chance files can be lost in an installation?
The same thing a shower does for your body after you haven't washed for a month.
From what you're implying, you have a
much bigger problem than a slow PC. Based on what you say, it appears these important photos and files kept on your PC are not being properly backed up.
What this means is that in your present state, the question isn't
if you'll lose your important files. A full wipe of a hard drive should
never cause
any important files to be lost and if this is the case, it means you've neglected a basic part of PC ownership.
As a rule of thumb, people will adhere to the 3-2-1 method for protecting their data. What this means is that, for all important data, you have a minimum of three copies, in a minimum of two different storage mediums, with a minimum of one copy being stored off-site.
Once you've remedied this -- and this ought to be considered an emergency, not something you get around to sometime -- then you can fully wipe the operating system drive and reinstall Windows. Windows builds up a lot of orphaned junk and fragments and conflicts and eliminating OS issues, which are very common causes of these types of problems with these vague symptoms, will aid immensely in troubleshooting.
Troubleshooting is a process of eliminating likely culprits; if you won't eliminate one of the likely culprits, then your ability to repair your PC becomes luck rather than design.