Need Help With Optimization. Need free Optimization programme.

I recently factory reset my pc. I have it cleaned it up. C: D: are clear of unwanted stuff.
Especially D: I found out it had 3 old backups on I couldnt see.

I dont want to have to buy avast optimizer. it works wonderfully on my phone and tablet.
I know it would be awesome. But dont have the money.

Can you please reccomend a good free optimizer tool?
If one exists.

It really needs to be optimized and bad files removed.
Is there a way to optimize it without a programme?

I think it causes problems.
My system reserved is 68% fragmented.
System reserved has never defragmented at all or properly.

I cant backup onto D:
D: is mostly free. So is C:
But it says its space unavailable.
The backups wont complete onto D:

I will have to backup onto a disc. if I can.

if its not a optimizer thing. Please can you tell me what could be wrong?

It also slows down for no reason on things.
it may be dust and overheating. or something else.

It's not internet reasons.

It needs taking to a it doctor and new heatsinks done and a time problem fixed.
A chip or software.

Also. What type of disc do you use for backups? Is it possible to use a rewritable that you reuse over and over?

Please can you help me.

Thank you. :)

I have a a flashdrive. But I dont want the backup to overwrite my files on it.

Will it overwrite the files? Its 32gb. Will it go in a seperate place to my files?

I'll read the link you put.