External HDD not detected

Hi
i recently had a hard drive failure which meant i was unable to use my laptop so i decide to use my external HDD (work on windows) as a backup drive until i bought a new HDD so i install Linux Ubuntu 11.04 on it (work fine) then when i fixed my laptop i wanted to remove linux and use my external HDD again as a storage device so i poped the linux cd in and deleted the partition so i thought i could use it again but its undetectable on my windows OS. it does not appear in my computer(when you double click the icon) but appears in my device manager.
Pls help me and thx in advance

Can you post a screen shot of Disk management?
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i tried giving my drive a letter but it gives me the decision of either formatting it to NTFS or exfat or to not forrmat tell me if you need a screenshot of this

Here is the screenshot

that same amount remove the hardrive

Take look at those tutorials:
Partition or Volume - Delete
Partition or Volume - Create New

hey i tried creating a new simple volume but only had the options of exfat and NTFS so i formatted it to NTFS cause i am planning to put ISO there and now its detectable are there any disadvantages? like will it support windows XP or only windows 7? thx for the help