My computer has recently been running extremely slowly

[iftikharf60 1]

Hello, everyone!
I'm having a problem with my company's computer, Amtex Enterprises. I'm hoping you can give me some advice. I've been using a Dell AIO Desktop for about a year for everyday tasks (Internet, word processing, etc.). Recently, I've noticed that my PC is running slower than usual. I had downloaded a file around that time. Do you believe this could be a problem?

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I'm looking for good advice on how to get my PC to work like it used to.

Thank you ahead of time
 

[PinkElephant 5,174]

What file ?

Iwan the terrible promissing 10 Mio in 30 days if you help him get his heritage out of the country for a small fee of 5.000$ ?