Its a minor issue normally caused due to a malicious program/malware/etc.. creating an Autorun file which prevents you from opening it.. try the following...
To Delete Autorun on all partitions :
1)Open Command Prompt (open Start/Run and type 'cmd' and press 'Enter')
2)now type 'X:' (where X is the drive letter for your partitions)
3)now type 'del autorun.* /f /q /s'
do this on all partitions by selecting/opening them using step 2 and then following the step 3...
Marked Solved 
