joyea,
It may perhaps have been wise to provide more information about your computer, particularly in regards to the amount of memory that is installed in it, and also how much of this remains spare after bootup when Spybot is not installed. This might have given an indication of whether there is enough free memory to support the latest Spybot installation.
Did you have SD helper and Teatimer options ticked during the installation, if so you could try an installation with them unticked, to see whether the basic Spybot will install and start up OK.
If you try this, also make sure that you leave getting the detection updates untill after the program is installed. After uninstalling Spybot and before reinstalling, clear out all of your browser caches and your temporary files, (Run Windows disk cleanup), then reboot. Try to minimise the amount of other software that might be running during the install.
Please post back and let's know whether this helped, and perhaps indicate the amount of memory and what antivirus and firewall software you have installed.