Hej.
Den skal være der, da den sørger for at andre ting kan køre. og derfor kan den optræde flere gange.
Lidt teknisk info om svchost.exe:
svchost - svchost.exe - Process Information
Process File: svchost or svchost.exe
Process Name: Service Host Process
Description: Application that works as a host process for services that run from dynamic link libraries.
Company: Microsoft Corp.
System Process: Yes
Security Risk ( Virus/Trojan/Worm/Adware/Spyware ): No
Common Errors: N/A
Du kan finde forklaringen her, samt en til næsten alle de systemprocesser der kører på din pc:
http://www.liutilities.com/products/wintaskspro/processlibrary/