SQL Server could not find the default instance (MSSQLSERVER)

Hello experts.
Trying to start the SQL server service i get the error:
SQL Server could not find the default instance (MSSQLSERVER) - please specify the name of an existing instance on the invocation of sqlservr.exe

I have this error after running the combofix and malwarebytes programm.
I looked around in the web but i could not find something to help me.Is there any solution before i reinstall the programm?
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Firstly, is this a Clustered environment?

If not, please specify if it is a SQL 2000/2005 box and also from where you are trying to start the service.
PanosAuthor Commented:
It is SQL 2000.It is set to auto start.I have the error on wndows start up too and when i'm trying to start it manually in the services.
Molnár IstvánHelpDesk / ProgrammerCommented:
Search your disks for sqlservr.exe, and when you find it for instance in
"C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Binn\sqlservr.exe",
open a command line window and run it with -v as argument
if not try to reinstall  the server

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PanosAuthor Commented:
I have found the file in the Binn folder.
Please a help for:open a command line window and run it with -v as argument

Molnár IstvánHelpDesk / ProgrammerCommented:
PanosAuthor Commented:
I type directly the command :sqlservr.exe -v and get the same error
Molnár IstvánHelpDesk / ProgrammerCommented:
i recommend you to reinstall the server
When is the last time that you were able to start the services successfully?

Have you made any changes recently on your machine?
PanosAuthor Commented:
I did reinstall the application and it is working.geek vi i did wrote that i got the problem after running the combofix and malwarebytes programm because i had  a problem with IE.
Molnár IstvánHelpDesk / ProgrammerCommented:
glad to hear it
Thanks Panosms. I was thinking of restoring your computer to an older point of time as combofix will create a restore point before doing any changes on your computer.

Please close the question if you are fine with the solution provided.
PanosAuthor Commented:
Thank you both for your help.
I have given some points to expert geek vi for his interest too and because i think that restoring the computer could probably solve the problem too.
Thanks panos. Your understanding is much appreciated!
Hi geek_vj:

did you ever use the restore point from combofix to resolve this issue?

PanosAuthor Commented:
No i did not use the restore point.
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