Inaccesible partitions after Windows 7 install

I have installed Windows 7 next to my old Windows XP (so it's a dualboot situation). I have 2 physical HDD's (320 GB each) and 6 logical drives (2 + 4 primary partitions, all NTFS). After installing Windows 7, two of 4 partitions in one hdd have become inaccessible - disk manager still shows them, but I can't neither set a drive letter, nor view properties. I get the following error:

"The operation failed to complete because the Disk Management console view is not up-to-date. Refresh the view by usin the refresh task. If the problem persists close the Disk Management console, then restart Disk Management or restart computer."

Both of the inaccessible partitions are fine in Windows XP. Any ideas or solutions ? ;/

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