@ crazy_code
Try a reboot and see if that has any impact.
If no difference - try a repair of avast:
XP - Add Remove programs, select 'avast! Anti-Virus,' click the Change/Remove button and select Repair, click next and follow.
Vista, win7 or later - Control Panel, Programs & Features, uninstall a program, select 'avast! Anti-Virus,' click the Uninstall/Change and select Repair, click next and follow.
You may need to reboot after the repair.
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That said you mentioned "but I'm guessing for my other computer. " are you trying to test that validity of the license on two computers ?
If it wasn't a multi PC license then avast would possibly have detected that license in use (the update checks) on more systems than the license is for.