I just purchased 74xl and 75xl cartritages but can't get them installed please help

Unfortunately no....the HP Photosmart C4385 printer uses HP 74/75 (or 74XL/75XL) ink cartridges. However, you can get your cartridges refilled at most Costco stores or any Fry's Electronics store at a fraction of the cost of a new ink cartridge.

For additional printer help or advanced HP printer diagnosis for you specific printer model, please visit Inkjet411:
http://www.inkjet411.com

Click this: http://www.shopping.hp.com/webapp/shopping/supplies_model.do?product_code=Q8232A&aoid=5504&lang=en&cc=us

Use the HP 74XL Black - 750 pages and the HP 75XL Tri-color - 520 pages, cartridges. They carry more ink.

Yes the guy at the Store was right, it should work on your printer (check out here), since you didn't mention the problem, I can't give you further instructions, I can only confirm that it's compatible with your printer.

If you are having trouble installing the cartridges, you can refer the tutorial (click here).

If you need further help, let me know with more details.

Good luck.

Thanks for using FixYa.

After printing alignment sheet scan the sheet,Issue will get fix but if not its a hardware failure.

You will simply need the 74XL (assuming you want the extended life 750 copies). It's the black cartridge.

HP 74 Black or HP 74XL Black High Capicaty,
HP 75 Color or HP 75XL Color High Capicaty.

These types of severe cartridge errors (i.e. "refer to documentation" / "incompatible cartridges", "print cartridge(s) problem", etc.) typically indicates the internal micro-electronics of the HP #74 / 75 (or 74XL/75XL) cartridge(s) are damaged. The cartridge's electrical wire runs at rear and lower side of the ink cartridge, are very delicate and are somewhat susceptible to ink attack over time, which can lead to premature failures. In addition, the older the cartridge the higher the chance of an internal electrical failure. I suggest you first run a 'Tap 41' diagnostic test to check cartridges electrical health (this is a forced test); you may also bypass the error (temporarily) on most models which use HP 74/75 cartridges. Refer to Inkjet411 youtube videos below:

HP 74, 75, 74XL, 75XL Cartridges - Solving Errors & Warnings: http://www.youtube.com/watch?v=C5ISTGyScWU

HP Photosmart C4200-C4500 and C5200-C5500a Printers - Diagnostic Tap 41 Test: (verifies electrical health of ink cartridges): http://www.youtube.com/watch?v=8fE-IM4AVMc

HP Photosmart 4200-4500 5200-5500 Printers -Cartridge Error Bypass (HP 74-75 Cartridges):

http://www.youtube.com/watch?v=UDxRkAGOJaI

HP Officejet J5700/J6400 Printers -Cartridge Error Bypass (HP 74-75 Cartridges):

http://www.youtube.com/watch?v=3X3_D90SSq4

Ink Refilling & Cartridge Care Tips - Everything you need to know: http://www.youtube.com/watch?v=FnXoDIblpdU

Your printer uses the following cartridges:

Black: 74, 74XL

TriColor: 75, 75XL

Photo: 99

Note: XL cartridges do about 3 to 4 times more pages.

Here is a list of available cartrides from HP:
Genuine Vivera Hewlett Packard C9369WN / HP 99 Photo OEM Ink Cartridge

Genuine Hewlett Packard CB337WN / HP 75 Tri-Color OEM Ink Cartridge

Genuine Hewlett Packard CB338WN / HP 75XL Tri-Color OEM Ink Cartridge
Genuine Vivera Hewlett Packard CB336WN / HP 74XL Black OEM Ink Cartridge
Genuine Vivera Hewlett Packard CB335WN / HP 74 Black OEM Ink Cartridge