Now here’s a challenge… Vista admin password without a keyboard??

Got an Acer Aspire 5315 with coffee’d keyboard. Bought a new keyboard on ebay and installed but most chars missing. Ordered that keyboard and writing this on an ancient PC. Have tried a USB dongle mouse and keyboard in the laptop, but it needs drivers. Used a mem stick to upload these to guest account so could copy and paste into Vista admin password entry, but it won’t accept CTRL-C/V. Anyone got any ideas? There must be some solution to this techy challenge…