Suddenly BSOD while working on my pc

No. When I was have installed SP1,those 2 days I was not having problems with BSOD. But I was having a lot of problems like: firefox was not starting,chrome was having some errors also. My pc has been extremlly slowed down...
One question for SP1. On site it says:

Downloading SP1 from the Microsoft website

• x86-based (32-bit): 4100 MB

So it's 4GB. When I go here it says that the 7601.17514.101119-1850_Update_Sp_Wave1-GRMSP1.1_DVD.iso is 1953.3MB.
Should I download that iso from 1.9GB and install SP1 with it?

The 4100MB is the estimated disk space the installation will take up; that's not the actual installation file.

The best use of your bandwidth would be either to download the windows6.1-KB976932-X86.exe file (537.8MB), or installing it via Windows Update.

I was thinking that it should be the estimated disk space...
I'll download that one with 1.9GB size. (I have enought internet transfer ) and will install it. But first need to move my files to other hdd. :)
Thanks for the answer.