Asked to reboot after custom scan

[SUPERAntiSpy]

Did my usual custom scan of the cookies/temp internet folders for both I.E and Firefox, it found it's usual tracking cookies, I do not believe it found anything file threats as I would have noticed that, but this time I was asked to reboot, any reason for this as I don't usually get a message requesting that I reboot after a custom scan.

SAS 4.15.1000

Windows 98 S.E

I.E 6

Firefox 2.0.0.14

One of the cookie files could have been locked, thus requiring the reboot.