Hi DarkMasterJuice ,
Please follow the steps Given below
1. Unnistall the Anti virus software
2.Perform a clean boot, goto START>MSCONFIG> Enter>Select StartupTAB
Disable all>then select Services TAB > Hide All Microsoft Services>Apply or
OK>
3. Goto Start>services> enter> Stop the windows udpate services
4.Goto Start>Computer>Local Disk C:\>Windows>Software distribution folder>
Try to rename it as SD.OLD
5.Restart the system and Try to install SP1
6.After completing the SP1 installation Please Goto START> MSCONFIG> General
TAB>Select Normal Startup > Select Apply or OK
7.Restart the system in normal mode You SP1 installation is done.