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15r 5520 Win 7 reinstallation Disk can I use in on my E4300
I have a new 15R 5520 that came with the Dell Win 7 64 bit reinstallation disc. My other laptop E4300 is running Win7 32 bit. It has corrupted registry ("Windows firewall can't change some of your settings Error code 0x80070422". ) and will need to be reformatted. There are registry files missing Dell tech said it was probably due to some type of Java virus. He said if I has my Win 7 32 bit disc I could try and run a repair but the disk is gone.
Since my E4300 is running Win7 that I installed and lost the disk Dell will not replace it cause it did not come w/ the machine. It Originally came w/ Vista Business (which you could not pay me to put on anything) so Dell offered to send me a new reinstallation disc XP Media Center .
My question is could I just do a fresh install on the E4300 using the disk that came with my newer 5520? I do have the serial numbers from my old Win7 32 bit disc but I think there useless w/o a disc. Dropping $100 or so for another Win7 disc is out of the question.
Bottom line could this be done?