Cannot access drives?

Im using xp sp2 and whenever i go in my computer folder i cannot access my drives through clickig or right clicking on their icons. when i do , it then opens a window, chose from the following program to open the application.

i can only access my drives from the explorer bar on top.

i have scanned the computer with avast . but there is no virus also. if anybody can tell me the answer then please.......

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Cannot access drives?hijackthis

I am facing same problem, No virus found. I scaned with NAV, AGV %26 QH. Now I am opening drives like - Press windows logo key with 'E' or 'e'. It will open file manager. Then click on desired drive it will open all folders and files.

Cannot access drives?malware

You might want to scan again or scan with something else. I've heard of that happening and it was a IRC bot infection. Everything that i've read about them has usually resulted in a format/reinstall.
This might help.
I have the EXACT same problem.

According to one of my students, it's a virus.

I think the infected file is "autorun.???".

I can't remember the extension unfortunately.

Scan your computer for virus.