Can you be any less specific about your issue?
If you could provide less details, we will be even less likely to have any
actual assistance for you.
Make sure your BIOS is up to date, your hardware drivers are the latest from
each component manufacturer, make sure you have fully scanned and eliminated
all malware/etc. Uninstall unneeded software and free up space. CHKDSK and
defragment and then download the stand-alone installer for SP2 and run it
from your computer.