Hiya
You wouldn't have been able to delete your .dat file. Its protected. What Spider does is empty the .dat file. It creates a new one when you Restart the PC, but it is empty.
Btw, when you run Spider, its amazing to have a look at. It lists ALL the sites you have visited.
Download version v1.16. Sacn for viruses as usual, then unzip it. Make a folder for it somewhere to extract it to. There will be 2 programs in there. Spider and SpiderBite. I don't bother with SpiderBite.
Now, when you have open Spider, click on the icon with the magnifying glass. Let it finish, then have a scroll through them to be nosy.
Then, click the icon with the ambulance. It will say The Spider Has bitten. Restart, and it will be recreated.
Regards
eddie