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What it caused. Is it allow to open drives by double-clicking? If so it's a script. Actually not harmful for the applications setup on your machine.
The Svchost.exe file is located in the %SystemRoot%\System32 folder. At startup, Svchost.exe checks the services part of the registry to construct a list of services that it must load. Multiple instances of Svchost.exe can run at the same time. Each Svchost.exe session can contain a grouping of services. Therefore, separate services can run, depending on how and where Svchost.exe is started. This grouping of services permits better control and easier debugging.
If the drives won't open by double-clicking then it would most likely be the copy.exe error!
I solve my problem just repairing XP.