I am experiencing two issues which may be related:
1) Firefox won't load most websites: Some sites such as Amazon and Yahoo load fine, but most other sites (eg. Reddit, Bleeping Computer) won't load with the tabs perpetually attempting to load. No error message is received for the tabs with sites that do not load. I reset Firefox and I also restarted Firefox with Add-on Disabled, and in both cases the same results occurred: most sites did not load and there were no error messages. When I restarted my PC in Safe Mode, then the previously "unloadable" sites loaded successfully. My Firefox version is 18.0.2.
2) Kaspersky indicates corrupt databases: During the last few days Kaspersky updates would not complete. Updates "hang" at 88% or 92%. I attempted to repair Kaspersky using Modify, Repair, Remove, but the updates still did not complete properly. Yesterday, Kaspersky indicated that the databases are corrupted. When I clicked on Fix It Now in Kaspersky, the update once again was unsuccessful and databases remained corrupted. I am running Kaspersky Internet Security 2010.
I ran a Malwarebytes full scan in Safe Mode, and the scan results indicated no infected objects.
My PC is using Windows XP.
Hopefully, the above has enough information to start diagnosing the problem. I appreciate any help you may be able to provide. Thank you!