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?
LVL 2
PanosAsked:
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Molnar 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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geek_vjCommented:
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.
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PanosAuthor Commented:
Hi.
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.
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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

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

Have you made any changes recently on your machine?
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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.
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Molnar IstvánHelpDesk / ProgrammerCommented:
glad to hear it
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geek_vjCommented:
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.
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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.
regards
panos
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geek_vjCommented:
Thanks panos. Your understanding is much appreciated!
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XChangingITCommented:
Hi geek_vj:

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

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