I would be on the lookout for a new pc myself, I cannot say how much they cost where you live but most countries have some type of lease or payment scheme for computers these days.
We often get offers to buy a pc for $7 AUD a week.
Several years ago I bought a laptop on finance and sold my desktop then put the money earned from the desktop sale towards paying off the laptop and paid off the remainder over time.
once you step away from trying to save outdated technology you will realise the ability to work faster than before and more reliably was well worth the outlay.
I too was stubborn and did not want to upgrade but was glad I did
If you have an old hard drive as well you may be facing data loss shortly as well
remember this is a business and time is money
Wicked1