Should I Reinstall Windows 7 on Home PC After Malware infected it?

I have Dell PC running Windows 7 Ultimate usually I used to play games on it. Couple of days ago it got infected by malware and when I web browser, suspicious websites opens up (Crypto) and some times it open 18 + websites on my PC. In addition I also experience performance issues sometime freezing and crashing while playing old games. I need suggestions regarding how to clean my Windows or I should reinstall it?

What is the exact 7-character "service tag" number on your Dell?

Does it still have all of its original hardware, or has some hardware been added to it or upgraded?

Do you have Windows 7 install media for it, and does it include Service Pack 1?

samuria said:

Have you scaned the pc to see if it removes anything?

Yes I did it but not satisfied with the performance

Hi

depending on which route you want to take

keep and clean --- shootover to BleepingComputers and follow the instructions here
Preparation Guide For Use Before Using Malware Removal Tools and Requesting Help - Virus, Trojan, Spyware, and Malware Removal Help

Reinstall - if your running W7 Pro a Dell Iso can be found at Heidoc

note
if there is a Crypto program on your system, therfor its likely mining which is causing your performance problems

yatoto:

You have not answered any of the 3 questions in post #2.

torchwood said:

Hi

depending on which route you want to takekeep and clean --- shootover to BleepingComputers and follow the instructions here
Preparation Guide For Use Before Using Malware Removal Tools and Requesting Help - Virus, Trojan, Spyware, and Malware Removal
Reinstall - if your running W7 Pro a Dell Iso can be found at Heidoc
note
if there is a Crypto program on your system, therfor its likely mining which is causing your performance problems

Let me check and update if its works for me

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flavallee said:

What is the exact 7-character "service tag" number on your Dell?
Does it still have all of its original hardware, or has some hardware been added to it or upgraded?
Do you have Windows 7 install media for it, and does it include Service Pack 1?

I have added a graphic card on my PC, No I don't have Windows 7 media.
Do I share my service tag number here ?

You can use system restore to restore to the point before your pc got infected