Solve : Windows 7 start up problem?

1.	Solve : Windows 7 start up problem?
Answer» My laptop configuration is PROCESSOR: Intel Celeron 900 2.2 GHz Ram: 1 GB Brand : Acer Extensa 4230 Operating system: Windows 7 Enterprise, Service pack 1 When I switch on the laptop “Press F2 for setup” screen appears and I had to press any key in keyboard then the windows continue to load. Before I don’t need to press any key and the system was working properly. Now I am experiencing the problem and the system is SLOW. Please advice me to rectify the fault What is new or different since the LAST time everything worked properly (ie, new hw, new sw, VIRUS, error, etc)?

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